---
product_id: 422502486
title: "MINIFOCUS 4\" Double Ball Aluminum Extension Arm, 1\" Ball Head Connector Underwater CNC Arm System Ball Head Extension for Strobe/Video Light/Diving Camera Tray, Waterproof and Rustproof (2pack)"
brand: "minifocus"
price: "204.92 DT"
currency: TND
in_stock: true
category: "Minifocus"
url: https://www.desertcart.tn/products/422502486-minifocus-4-double-ball-aluminum-extension-arm-1-ball-head
store_origin: TN
region: Tunisia
---

# Waterproof & rustproof design 4-inch precision length CNC anodized aluminum alloy MINIFOCUS 4" Double Ball Aluminum Extension Arm, 1" Ball Head Connector Underwater CNC Arm System Ball Head Extension for Strobe/Video Light/Diving Camera Tray, Waterproof and Rustproof (2pack)

**Brand:** minifocus
**Price:** 204.92 DT
**Availability:** ✅ In Stock

## Summary

> 💡 Illuminate your underwater world with precision and style!

## Quick Answers

- **What is this?** MINIFOCUS 4" Double Ball Aluminum Extension Arm, 1" Ball Head Connector Underwater CNC Arm System Ball Head Extension for Strobe/Video Light/Diving Camera Tray, Waterproof and Rustproof (2pack) by minifocus
- **How much does it cost?** 204.92 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/422502486-minifocus-4-double-ball-aluminum-extension-arm-1-ball-head)

## Best For

- minifocus enthusiasts

## Why This Product

- Trusted minifocus brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Universal Compatibility:** Fits all 1" ball head arm systems for seamless gear integration
- • **Lightweight Hollow Design:** Minimizes drag and fatigue during extended dives
- • **Stable 1" Ball Head Connector:** Silicone O-ring friction gaskets for secure, wobble-free attachments
- • **Premium Corrosion-Resistant Alloy:** CNC-machined aluminum ensures durability in harsh marine environments
- • **Precision 4" Double Ball Extension:** Optimized length for versatile underwater lighting setups

## Overview

The MINIFOCUS 4" Double Ball Aluminum Extension Arm (2-pack) is a lightweight, corrosion-resistant underwater accessory crafted from anodized CNC aluminum alloy. Designed for professional divers and photographers, it features a hollow design to reduce drag, stable 1" ball head connectors with silicone O-rings for secure attachments, and universal compatibility with all 1" ball head arm systems. Waterproof and rustproof, this extension arm optimizes your strobe or video light positioning to capture stunning underwater visuals.

## Description

desertcart.com: MINIFOCUS 4" Double Ball Aluminum Extension Arm, 1" Ball Head Connector Underwater CNC Arm System Ball Head Extension for Strobe/Video Light/Diving Camera Tray, Waterproof and Rustproof (2pack) : Electronics

## Features

- Specification: Length: 4" /10.2 cm; Ball size: 1"/25 mm; Weight: 5 oz/141 g. 2x 4" double 1" ball extension arm; 2x free replacement O-rings
- High Quality Material: Made by corrosion resistant anodized CNC aluminum alloy, anti-corrosion; The hollow design makes it lighter and reduces resistance when used underwater
- Ball Head with Protection Ring: 1" ball head made by corrosion resistant anodized aluminum alloy with silicone O-ring friction gaskets, avoid friction during connection and make the connection more stable
- Free Extension: 4" double 1 inch ball arm supports to connect strobe or video light, freely adjust the angle to get the best lights angles to take the best photo you want
- Connector: Double ball adapter connect your underwater strobe or video light via the light holder; The size is universal and compatible for all arm systems that has a ball head which diameter is 25 mm/1 inch

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09PR75JYD |
| Best Sellers Rank | #2 in Underwater Lighting Parts & Accessories |
| Brand | MINIFOCUS |
| Built-In Media | 2 x 1 inch ball arm |
| Color | 2PCS 4'' Double Ball Extension Arm |
| Compatible Devices | All arm systems that has a ball head which diameter is 25mm/1 inch |
| Customer Reviews | 4.8 4.8 out of 5 stars (128) |
| Folded Size | 4 inches |
| Item Dimensions D x W x H | 1"D x 1"W x 5"H |
| Item Type Name | Double ball extension arm. |
| Item Weight | 4.1 ounces |
| Manufacturer | MINIFOCUS |
| Manufacturer Part Number | MF-04 |
| Maximum Weight Recommendation | 5 ounces |
| Media Type | ProductImage |
| Model Name | MF-04 |
| Model Number | MF-04 |
| Number of Items | 2 |
| Number of Packs | 2 |
| Screen Size | 4 inches |
| Unit Count | 2 Count |
| Warranty Description | 90 days |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** MINIFOCUS
- **Color:** 2PCS 4'' Double Ball Extension Arm
- **Compatible Devices:** All arm systems that has a ball head which diameter is 25mm/1 inch
- **Folded Size:** 4 inches
- **Item Weight:** 4.1 ounces
- **Number of Items:** 2
- **Number of Packs:** 2
- **Product Dimensions:** 1"D x 1"W x 5"H
- **Unit Count:** 2 Count

## Images

![MINIFOCUS 4" Double Ball Aluminum Extension Arm, 1" Ball Head Connector Underwater CNC Arm System Ball Head Extension for Strobe/Video Light/Diving Camera Tray, Waterproof and Rustproof (2pack) - Image 1](https://m.media-amazon.com/images/I/615qPT7r8OL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: These are suitable for Underwater/Marine use?**
A: These extension arms can be used under sea water. First of all, this product is underwater shooting supplies. Secondly, this ball extension arm is made of aluminum alloy, which has excellent corrosion resistance.

**Q: Will the small balls at the ends slip?**
A: Having never have slip while using them as long as you remembered to tighten the clamp. The friction from the silicone ring and the clamps, which can be adjusted to obtain by adjusting the clamp locking.

**Q: An extension arm has two length sizes, how should I choose?**
A: From this end of the ball to the other end of the ball is the overall length of the extension arm, but according to the actual size of the product that can be used, it should start from the red silicone O-ring.

## Frequently Bought Together

- MINIFOCUS 4" Double Ball Aluminum Extension Arm, 1" Ball Head Connector Underwater CNC Arm System Ball Head Extension for Strobe/Video Light/Diving Camera Tray, Waterproof and Rustproof (2pack)
- MINIFOCUS 4PCS 1'' Aluminum Ball Clamp Mount for Underwater Diving Light Arms Tray System, Photography Diving Camera, 360° Clip Adapter Bracket for Action Camera Flashlight Arms System
- 4Pcs Underwater Camera Buoyancy Float Kits, Buoyancy Provided 175g*4, Diameter 3.15", Thickness 1.5", Aquatic Arm Float Kit for Seafrogs/nitescuba/Starbea Floating Arms Diving Tray

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**Shop now:** [https://www.desertcart.tn/products/422502486-minifocus-4-double-ball-aluminum-extension-arm-1-ball-head](https://www.desertcart.tn/products/422502486-minifocus-4-double-ball-aluminum-extension-arm-1-ball-head)

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-09-14*