Conte Sub

Stark+ Muzzle for Spearfishing Spearguns

The Stark+ Muzzle is designed to ensure a watertight seal, lightweight construction, and mechanical strength for spearfishing applications. It stands out for its compact, rugged structure, ideal for use with spearguns featuring a barrel with a 26 mm internal diameter.

Technical Features

• Reinforced stopper plate, thicker than the previous model, with two dedicated eyelets for direct attachment of the return lines.
• Incorporates two line-wrap pins for routing the line in both directions, plus a line-guide eyelet for precise control of the line coming off the reel.
• Optimized pulley mounting system, ensuring smooth travel during tracking and improving cord management.
• Double O-Ring connection for a perfect watertight seal on the barrel, preventing water ingress and ensuring reliability while freediving.
• Simple fastening with a self-tapping screw, supplied with a pair of plastic discs to protect the wishbone knot and prevent impacts against the stopper.

Compatibility

Designed for use with spearfishing spearguns with a 26 mm internal barrel diameter, the Stark+ Muzzle integrates easily with the most common setups in the spearfishing sector.

Inverter Muzzle Kit for C4 Graphite

The Inverter Muzzle Kit is designed to allow the C4 Graphite speargun to integrate any inverted propulsion system, expanding its configuration options for spearfishing.

Each component in the kit is engineered to ensure maximum ease of use, allowing quick and simple assembly and disassembly at any time, without compromising the functionality of the propulsion system.

With this kit, the spearfisher can effectively customize their setup, improving thrust management and accuracy while tracking the target, without making permanent modifications to the speargun.

Technical Features

• Specific compatibility with the C4 Graphite model
• Modular components that are easy to assemble and disassemble
• Designed for inverted propulsion systems
• Durable materials to ensure long-lasting performance and reliability in the marine environment

Invert Band Anchor Base compatible with C4 Graphite speargun

The Invert band anchor base is a technical component designed for use with the C4 Graphite speargun, specifically engineered for mounting the bands used on this model.

Paired with the Invert muzzle kit for Graphite, it allows you to adopt an inverted propulsion system, changing how band power is delivered to improve swing efficiency and recoil management during spearfishing.

Technical features

• Compatible with the C4 Graphite speargun
• Compatible with original reels and the LG Twist 80 reel, providing flexibility in equipment selection
• Quick and easy assembly and disassembly of each kit component, for simple setup customization

This anchor base is made from durable materials and designed to remain lightweight and practical in the water, ensuring optimal transfer of band force and effective hydrodynamic trim management during underwater use.

Black Zirconia Pulleys for Roller Spearguns

The pair of Black Zirconia pulleys for Roller Speargun spearguns is built to ensure high reliability for spearfishing and freediving. The outer structure in black Delrin is machined from solid stock, ensuring dimensional precision and the strength required for underwater use.

Technical features

• Material: high-strength black Delrin, unaffected by corrosion and marine temperatures
• Maximum working load: 169 kg, significantly higher than equivalent 316 stainless steel bearings
• Rotation speed limit: 9000 rpm, more than three times higher than traditional stainless steel bearings
• Outside diameter: 28 mm
• Groove diameter (trapezoidal section): 20 mm, compatible with bands up to 16 mm in diameter
• Inner shaft bore diameter: 6 mm, intentionally larger to transfer the load to the bearing
• Thickness: 15 mm

Construction details and functional advantages

The pulley is equipped with a calibrated cap that allows the bearing to be precisely centered on the centerline, optimizing smooth rotation and reducing premature wear. The central bore, enlarged relative to the axle, shifts the working load primarily onto the bearing, improving mechanical efficiency and protecting the pulley from excessive stress.

The trapezoidal groove is designed to accommodate spearfishing bands up to 16 mm in diameter, ensuring proper grip without compromising the smoothness and responsiveness of the pulley during tracking and shaft release.

In addition, Black Zirconia pulleys require minimal maintenance, as they are highly resistant to the corrosive agents typical of the marine environment and to temperature variations, ensuring long-lasting use over time.

Invert Style Wood 37 - Muzzle kit for wooden spearguns with inverted propulsion

Invert Style Wood 37 is a muzzle kit designed specifically for wooden spearguns with an inverted propulsion system and integrated stopper, ideal for models such as Demoltiplicati, Vela, Volcan, and Invert Roller Speargun.

The kit frame is CNC-machined from a solid block of Delrin (acetal resin), a material known for its light weight and mechanical strength, helping improve the trim and ease of swing of the speargun.

The system integrates two Invert 37 pulleys, also machined from solid Delrin, ensuring superior durability and efficient power transfer during speargun band loading and release.

The kit is installed on the speargun body using the pulley axle and a rear locking pin, both included in the package, ensuring precise and secure mounting.

Main technical features

• CNC-machined Delrin frame to optimize lightness and strength
• Compatible with wooden spearguns with inverted propulsion and integrated stopper
• Solid-machined Invert 37 pulleys for high mechanical strength
• Easy installation using the included pulley axle and rear locking pin

Invert Wood 37 Muzzle Kit for Inverted-Propulsion Wooden Spearguns

Invert Wood 37 is a muzzle kit designed specifically for wooden spearguns with an inverted propulsion system and integrated stopper, suitable for models such as Demoltiplicati, Vela, Volcan, Invert Roller Speargun, and similar designs.

Construction and Materials

The kit frame is made of laser-cut stainless steel, reducing size and weight—key factors for improving the trim and tracking of the speargun while freediving.

The Invert 37 pulleys mounted on the frame are machined from Derlin and solid-turned PVC, materials selected to ensure maximum strength and long-lasting durability under the stresses of spearfishing.

Installation and Compatibility

The Invert Wood 37 muzzle kit is installed using the pulley through-shaft and the rear locking pin, both essential components for ensuring a stable and secure fit.

The kit is optimized for inverted-propulsion wooden spearguns, enhancing the functionality and precision typical of this type of spearfishing gun.

Level 2 Frame for Roller Speargun Propulsion Spearguns

The Level 2 frame is designed as a lower band anchor specifically for spearguns with a roller propulsion system, optimized primarily for use in inverter systems.

Technical Features and Functionality

The frame configuration allows the bands to be positioned in a rearward seat, almost against the trigger, significantly improving the overall efficiency of the propulsion system and ensuring greater accuracy during the shot.

Made entirely from stainless steel and laser-cut, the frame provides high mechanical strength and durability in underwater environments.

Comfort and Ease of Use

• Compact dimensions and low weight to avoid altering the speargun’s trim during freediving or spearfishing
• Simple, quick installation on the speargun thanks to its functional design
• Foldable and removable trigger guard, adaptable to different user requirements
• Compatible with reels of any type, for customization and versatility in your underwater setup

Included Components and Accessories

• Supplied with specific screws and inserts for a solid, secure assembly
• Trigger guard can be installed or removed according to operational needs

Spear Truck CB5 - Performance: Pulley System for Invert Roller Spearguns

Spear Truck CB5 - Performance is an advanced pulley system designed specifically to manage and support band load on Invert Roller spearguns. Manufactured with precision CAD technologies, this system is engineered to optimize band organization, ensuring even load distribution.

Design and Materials

The pulleys are machined from solid stock using a special high-sliding polymer, with a deep groove that ensures excellent band grip, preventing slippage during use. The trapezoidal frame, made from solid-stock stainless steel, provides high mechanical strength and securely retains the bands inside it. The structure prevents unintended band slipping and allows effective pulley activation.

Functionality and Technical Benefits

• The system features five small hourglass-shaped cylinders that allow the bands connected to the trolley to move in parallel, improving smoothness and precision in power transmission.
• Supports the installation of multiple bands, optimizing space and maintaining correct positioning for balanced tension.
• Ensures a symmetrical, balanced load that improves the speargun’s reliability and durability during tracking and firing.

Applications

This system is particularly suitable for positioning bands under the belly of flat, wide speargun bodies, offering high efficiency in band organization for spearfishing and freediving.

Spear Truck Performance pulley system for Invert Roller Spearguns

Spear Truck Performance is a pulley system designed specifically to organize and support band loading on Invert Roller Spearguns and demultiplied spearguns.

Technical features

• CAD design and manufacturing with advanced technologies to ensure precision and reliability.
• Pulley machined from solid special polymer, with a deep groove for maximum grip and to prevent line slippage.
• Band attachment via three hourglass-shaped cylinders that ensure a symmetrical and balanced load on the trolley.
• Frame made of stainless steel, consisting of two 1.5 mm plates to combine mechanical strength and lightness.
• Through-type pulley axle, designed to maintain hold under any load without compromising system operation.
• Diamond-shaped configuration capable of mounting up to four bands, optimizing overall size while maintaining correct band positioning.

Benefits in spearfishing use

The structure ensures a perfectly distributed load that improves the efficiency of power transfer from the bands to the speargun, making the gun easier to handle while spearfishing. The quality of the materials and the design contribute to greater durability and system reliability in the marine environment.

LP Low Profile Pulleys for Spearfishing Spearguns

The low-profile LP Pulleys, designed by Contesub, are developed for spearfishers who require easy lateral tracking of the speargun. Their compact structure improves handling and ergonomics during dives.

Technical Features

• Equipped with a double internal bushing made with technologically advanced materials and precision manufacturing processes.
• Allow smooth band movement even under high loads, optimizing the efficiency of the roller system.
• Compatible with 6 mm axles.
• Suitable for bands with diameters up to 18 mm, with a preference for 16/17 mm bands.
• Thickness (pulley width) of 15 mm, balanced to minimize bulk without sacrificing mechanical strength.

Applications and Use

LP pulleys improve force transmission and band tension smoothness in spearfishing spearguns, making lateral tracking easier and contributing to more precise trim during underwater shooting.

Product Details

• Package containing 2 pulleys.
• Ideal for optimizing roller systems on spearguns with large-diameter bands.

Pair of Invert 37 Pulleys for Roller Spearguns

This pair of Invert 37 pulleys is specifically designed for Roller Speargun spearguns used in spearfishing. The outer component is made from black Derlin, machined from solid stock to ensure strength and long service life.

The pulleys are suitable for supporting lines with a diameter up to 3.0 mm, ensuring reliable operation during freediving sessions.

Technical Features

• Outer diameter: 37 mm
• Groove diameter: 31 mm
• Inner diameter (shaft): 6 mm
• Thickness: 6 mm

The internal bushing is made using high-tech materials and processes, ensuring optimal smoothness and high mechanical resistance during underwater use. This provides smooth line movement and improved shot efficiency.

Call Fish Trick 2.0 - Spearfishing Fish Caller

Call Fish Trick 2.0 is a mechanical fish caller designed to support spearfishing, featuring a mounting system compatible with the plastic handle guard of most spearguns on the market.

The caller attaches securely using the included stainless steel bracket, which ensures mechanical strength and durability even in the marine environment. The bracket is designed with two sets of holes: one set is dedicated to mounting on the handle guard, while the other allows you to adjust the caller’s position for ergonomic, immediate access during spearfishing.

This setup allows the caller to be activated with the thumb of the hand holding the speargun, ensuring easy, precise control without compromising grip or mobility.

In addition, the kit includes an adjustable ring, designed for those who prefer to use the caller hands-free, increasing the device’s versatility during dives.

Technical Features

• Mounting via stainless steel bracket for high strength and durability in the marine environment
• Dual set of holes to customize positioning on the speargun handle guard
• Comfortable thumb activation with the hand holding the speargun
• Optional adjustable ring for hands-free use

Benefits for Spearfishing

• Practical and fast caller activation without having to change grip
• Easy integration with existing underwater equipment thanks to the modular mounting system
• Rugged construction ensured by the materials, essential for excellent resistance during dives

Derlin reel base for Invert Roller Spearguns

The reel base is made entirely from Derlin, a material valued for its high mechanical strength and light weight, essential characteristics for in-water use during spearfishing.

This accessory is specifically designed to ensure correct reel positioning on the speargun, preventing any contact between the bands and the frame. This helps maintain the integrity of the gear and improve its durability over time.

The base is designed for mounting LG Sub reels, Twist 80 and Twist 100 models, ensuring precise and stable installation. In addition, thanks to its compatibility with suitable screws, it can be used with most reels available on the market, offering versatility and practicality for different spearfishing setups.

Large Stainless Steel Pretensioning Anchor for Roller Speargun and Inverted-Roller Spearguns

This pretensioning anchor is specifically designed for use with Roller Speargun and inverted-roller spearguns used in spearfishing and freediving in general. Made entirely of stainless steel, it ensures high mechanical strength and long-lasting durability even in saltwater environments.

It mounts to the underside of the speargun barrel using two stainless steel self-tapping screws, included in the package, ensuring stability and the proper level of band pretensioning to keep propulsion power consistent.

Technical Specifications

• Material: stainless steel with high corrosion resistance
• Compatibility: Roller Speargun and inverted-roller spearguns
• Size: Large, ideal for larger-caliber speargun models
• Mounting: with stainless steel self-tapping screws, included

The use of quality materials and purpose-built design ensure efficient power transfer from the bands, maintaining consistent tension over time and improving accuracy and smooth tracking of the speargun.

Pretensioning Hook for Roller Speargun and Inverted Roller Spearguns

Pretensioning hook specifically designed for the bands of Roller Speargun and inverted roller spearguns used in spearfishing. Made from CNC press-brake formed stainless steel, it ensures high mechanical strength and long-lasting performance in saltwater environments.

The hook mounts to the underside of the speargun barrel using a pair of stainless steel self-tapping screws, included in the kit, ensuring a stable and secure installation.

Technical Features

• Material: high-strength stainless steel
• Manufacturing: CNC press-brake forming for precision and durability
• Mounting system: stainless steel self-tapping screws included
• Size: Large

This pretensioning hook is designed to ensure optimal band tension management, helping improve shot response and power in spearfishing spearguns.

R1 Special Stopper for Roller Spearguns

The R1 Special Stopper is a flat-base component designed to be installed on the muzzles of roller spearguns. Made from skeletonized stainless steel, it ensures strength and stability when mounted.

The body is laser-cut and undergoes mechanical and chemical treatments that remove sharp edges and even out the coloration, improving the surface finish.

The upper edges are rounded and polished to prevent premature wear of textile wishbones, ensuring longer life for the material in contact.

Its shape and dimensions are designed to allow the use of any standard commercially available shaft, offering compatibility and versatility.

Design and mounting

• Front section equipped with two symmetrical line-wrap pins, allowing the shaft to be effectively secured with the line wrap from either the right or the left.
• Base with two holes for mounting using the included stainless steel self-tapping screws, ensuring a solid and durable installation.

Technical specifications

• External dimensions: length 85 mm (of which 70 mm rests on the barrel), width 15 mm, height 15 mm
• Usable internal section dimensions: width 11 mm, height 13 mm
• Weight: 18 grams

Stainless Steel Pretensioning Anchor for Roller Speargun and Inverted Roller Spearguns

This pretensioning anchor, specifically designed for roller spearguns and inverted roller spearguns, is made entirely of stainless steel with high mechanical strength, ensuring durability and reliability in underwater environments.

It is mounted on the underside of the speargun barrel using a pair of stainless steel self-tapping screws, included, which provide secure anchoring without compromising trim or accuracy while spearfishing.

Technical Specifications

• Material: Marine corrosion-resistant stainless steel
• Application: Compatible with roller and inverted roller spearguns
• Available size: Small
• Included accessories: Stainless steel self-tapping screws for installation

The pretensioning anchor enables effective band adjustment, improving tension and responsiveness of the speargun, helping provide smoother tracking and more precise thrust during release.

Pretensioning Hook for Roller Speargun and Inverted Roller Spearguns

The pretensioning hook is specifically designed for use on roller spearguns and inverted roller spearguns, ensuring secure band anchoring and optimal tension distribution.

Materials and Construction

Made from stainless steel processed with CNC press-brake forming, the hook ensures high mechanical strength and durability in the underwater environment. Stainless steel is suitable for the corrosion typical of saltwater, maintaining its structural properties unchanged over time.

Installation

It is mounted on the underside of the speargun barrel using a pair of stainless steel self-tapping screws, supplied with the product. This anchoring system makes installation and replacement of the hook easier, providing stability and safety during band loading.

Technical Specifications

• Size: Small
• Material: Stainless Steel with CNC press-brake forming
• Compatibility: Roller Speargun and inverted roller spearguns

Special Stainless Steel Side Plates for Roller Spearguns

The Special Side Plates are made from laser-cut stainless steel, designed specifically for roller spearguns with 6 mm diameter pins.

One of the two side plates features a forked end that allows the shaft’s nylon line to pass through, preventing direct contact with the bands and reducing wear on the sliding materials.

The robust 1.5 mm thick construction provides optimal mechanical strength without adding excessive weight to the assembly.

Technical Features

• Compatible with 6 mm diameter pins
• Stainless steel thickness: 1.5 mm
• Center-to-center distance of mounting holes: 7.5 cm
• Forked end for shaft nylon line routing
• Laser-cut finish for precision and clean edges
• Supplied with 4 self-tapping screws for quick, secure installation

Benefits in Use

• Ensure long-lasting durability thanks to stainless steel resistant to marine corrosion
• The forked end reduces wear on the nylon line and power bands, maintaining consistent shot smoothness
• Simple, reliable installation with included self-tapping screws

U1 Special Stopper for Roller Spearguns

The U1 Special Stopper is a round-base accessory specifically designed for installation on roller speargun muzzles. Made from lightened stainless steel, it ensures strength and stability during underwater use.

Materials and Finishes

The stopper body is laser-cut and undergoes mechanical and chemical treatments designed to eliminate sharp edges, improving safety and ensuring a uniform finish. The upper edges are rounded and carefully polished to prevent premature wear of textile wishbones, preserving their integrity and service life.

Design and Compatibility

The shape and dimensions have been engineered to allow use with any standard shaft available on the spearfishing market. The front section features two tips that make it easier to route the shooting line needed to securely lock the shaft. The symmetrical design allows the line wrap to be made from either the right or left side, offering maximum installation versatility.

Mounting and Installation

• Base with two mounting holes
• Mounted using the stainless steel self-tapping screws included in the package

Technical Specifications

• External dimensions: length 91 mm (including 77 mm of contact surface on the barrel), width 17 mm, height 15 mm
• Usable internal section dimensions: width 14 mm, height 13 mm
• Weight: 16 grams

Wrist Loader for Roller Spearguns

Specific loader for use with roller spearguns, designed to make the loading phase easier during spearfishing. Made with corrosion-resistant materials, it includes a stainless steel hook to ensure a secure, long-lasting hold in the underwater environment.

The kit includes a rugged line, designed to provide reliability and practicality when managing the cord during speargun loading. This wrist loader ensures comfortable use and seamless integration with the handling and release dynamics of a roller speargun.

• Extremely durable material: stainless steel hook with high resistance to saltwater corrosion
• Practicality: strong, properly sized line for smooth handling during loading
• Compatibility: designed specifically for roller spearguns

Elsa Stainless Steel Trigger Guard

The Elsa trigger guard is made from stainless steel with a thickness of 1.5 mm, ensuring high mechanical strength and long-lasting durability even in marine environments.

This accessory is designed to be easily shaped, allowing it to fit perfectly to any type of spearfishing gun handle. Its pre-formed shape provides full trigger protection, reducing the risk of accidental firing during dives.

Two self-tapping screws are included for fast and secure mounting, making installation easier without compromising the structure of the speargun.

ConteSub Ninja Stainless Steel Line Release

The ConteSub Ninja line release is designed to make loading easier for spearfishing and freediving. Its original shape allows for simple, immediate use, automatically locking into the correct position once the spear shaft is engaged.

Materials and construction

Made entirely from high-quality stainless steel using laser cutting, it ensures high mechanical strength and durability in marine environments, preventing corrosion and wear even after prolonged use in salt water.

Included accessories

• Self-tapping screw for secure, stable mounting
• Two washers to ensure proper pressure distribution and improve mechanical hold

This line release is a practical, reliable accessory for spearfishing and freediving, optimizing line management and smooth loading thanks to its ergonomics and functionality.

Flat Stainless Steel Trigger Guard Handle

Flat trigger guard handle made from 1.5 mm thick stainless steel, designed to provide effective, long-lasting trigger protection on spearfishing spearguns.

This accessory is easy to shape, allowing a perfect fit on any type of handle. Its flat design provides full trigger protection, reducing the risk of accidental shots during dives.

The quality stainless steel ensures high mechanical strength and excellent durability in saltwater environments, preserving the integrity of the component even after repeated use in seawater.

The kit includes two self-tapping screws for simple, secure fastening, ensuring stability and making installation easy without requiring structural modifications to the speargun.

Conte Sub M4 Axle for Stainless Steel Pulleys

The Conte Sub M4 axle is specifically designed for pulleys with an inner diameter of 6 mm, made from stainless steel to ensure mechanical strength and durability in underwater environments.

Technical Features

• Material: high-strength stainless steel
• Axle diameter: 6.0 mm with M4 thread
• Available lengths: 45 mm, 50 mm, 56 mm, 60 mm, 80 mm
• Included in the kit: screws and two pairs of washers for secure, efficient installation

Use and Benefits

This axle is ideal for spearfishing and freediving applications where precision pulley installation is required, ensuring stability and reliability even during extended underwater use and contact with saltwater.

The use of stainless steel improves the component’s service life, helping prevent corrosion and wear, while the multiple washers provide a solid assembly that maintains the correct position of the pulley system.

Base for Wooden Speargun Handles

Base designed in 2 mm-thick stainless steel, specifically made to provide protection and ballast to the rear section of the spearfishing speargun handle.

This technical component ensures strength and mechanical resistance, improving the speargun’s trim during underwater use without compromising handling.

Technical Features

• Material: stainless steel with high corrosion protection in marine environments
• Dimensions: 55 x 33 mm
• Weight: 23 grams, balanced to provide effective rear ballast
• Mounting: anchoring system with two M4 screws and included threaded brass bushings, for a secure and durable connection to the wooden handle

Applications

Ideal for supporting the handle of spearfishing spearguns, providing protection against mechanical stress and allowing proper speargun balance to improve tracking accuracy and stability during underwater use.

Cover for Weight Compartment

Technical cover designed specifically for the weight compartment located on the lower part of the speargun barrel. This component provides reliable, long-lasting protection for the weight housing during freediving and spearfishing.

Materials and Technical Features

• Made from stainless steel with a thickness of 1.5 millimeters, ensuring high mechanical strength and durability in saltwater environments.
• Precision laser cutting ensures excellent fit and accurate finishing, improving the ergonomics and safety of the speargun.
• Supplied complete with a pair of self-tapping screws and stainless steel washers for stable, long-lasting fastening.

Applications and Benefits

The cover effectively protects the weight compartment from debris and damage during use in the water. The use of corrosion-resistant materials makes this component ideal for the demands of spearfishing and freediving, ensuring a robust structure without affecting the speargun’s trim or handling.

Rubber Pads for Chest Loading Pad - ConteSub

The ConteSub rubber pads are essential components for anyone building or customizing their own spearfishing speargun. Made from 5 mm thick high-density rubber, these pads are designed for creating the chest loading pad and the handle base, providing a secure, stable, and protective contact point during loading.

Versatility and Easy Installation

Each pair of pads is supplied oversized, so it can be freely cut and shaped to match the exact dimensions of your speargun. This feature makes them suitable for any speargun, whether during building, maintenance, or upgrading.

• High-density rubber for maximum strength and long-lasting durability
• 5 mm thickness for a comfortable and stable chest loading support
• Easy to cut and shape to size with standard workshop tools
• Suitable for both the chest loading pad and the handle base
• Supplied with 4 stainless steel self-tapping screws for installation
• Saltwater-resistant materials built to withstand marine conditions

Professional Component for DIY Spearguns

Whether it is a ConteSub semi-finished speargun or a custom project, these pads are the professional solution for ensuring reliable chest loading support when loading the speargun. The high-density rubber protects the wetsuit during loading and ensures a firm, secure grip in all conditions.

Stainless Steel Weight Modules for Speargun

The weight modules are designed to allow precise trim adjustment of your speargun, optimizing balance in the water during spearfishing.

The option to use one or more modules, even in different sizes, lets you customize trim in a modular and effective way, simply by stacking them on top of each other to achieve the desired weight.

Made using laser cutting, the modules provide an anti-reflective finish, essential for reducing visibility underwater and improving camouflage during spearfishing.

• Material: Corrosion-resistant stainless steel
• Finish: Anti-reflective, achieved through laser processing
• Available variants: Small

Using the weight modules helps optimize speargun control, improving maneuverability and accuracy during spearfishing action.

Stainless Steel Ballast Module for Spearfishing

The ballast module is made from stainless steel using laser cutting, ensuring high shape precision and clean finishes. This material provides superior mechanical resistance to the corrosion typical of the marine environment, essential for use during extended dives while spearfishing.

The module has a thickness of 1.5 millimeters, sized to provide an optimal balance between weight and bulk, helping maintain proper trim underwater without compromising freedom of movement.

The overall dimensions of the ballast module are 1.5 cm x 7.8 cm, a compact size ideal for integration into custom weight holders or specific freediving and spearfishing belts.

The product is supplied complete with a self-tapping screw for mounting, making it easy to install securely and stably directly onto dedicated support structures, with no special tools required.

Closed-End Brass Threaded Insert

The brass threaded insert is designed with a closed end and external knurling that ensures better anchoring in support materials. This technical feature provides a firm, long-lasting hold, reducing the risk of loosening during use in underwater applications.

The choice of brass, a corrosion-resistant material, is particularly suitable for the marine environment associated with freediving and spearfishing, where component reliability is essential for the safety and functionality of underwater equipment.

Technical Features

• Material: brass, corrosion-resistant
• Closed end to prevent water ingress
• External knurling for improved anchoring
• Available in two sizes: M3 and M4

Brass insert with long expansion body and external knurling

This insert is made from brass, a material known for its mechanical strength and durability in marine environments, ideal for freediving and spearfishing. The long expansion design ensures a stable and secure hold, while the external knurling makes installation and quick removal easier, improving practicality during frequent assembly and disassembly operations.

The insert is available in two sizes, M4 and M5, to suit different underwater equipment requirements.