--- product_id: 422502486 title: "4\" Double Ball Extension Arm" brand: "minifocus" price: "€ 44.38" currency: EUR in_stock: true reviews_count: 12 category: "Minifocus" url: https://www.desertcart.ie/products/422502486-4-double-ball-extension-arm store_origin: IE region: Ireland --- # Waterproof & rustproof for underwater use 4" double 1" ball extension arms Corrosion-resistant anodized aluminum 4" Double Ball Extension Arm **Brand:** minifocus **Price:** € 44.38 **Availability:** βœ… In Stock ## Summary > 🌟 Elevate your underwater rig with precision and style β€” don’t just shoot, dominate the depths! ## Quick Answers - **What is this?** 4" Double Ball Extension Arm by minifocus - **How much does it cost?** € 44.38 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/422502486-4-double-ball-extension-arm) ## 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 - β€’ **Adjustable Angle Freedom:** Double ball arms allow infinite positioning to capture perfect lighting angles every time. - β€’ **Lightweight Hollow Design:** Optimized for minimal drag and maximum maneuverability during underwater shoots. - β€’ **Precision CNC Aluminum Alloy:** Engineered for ultra-durable, corrosion-resistant performance that stands up to the harshest underwater environments. - β€’ **Universal 1" Ball Head Connector:** Seamlessly compatible with all 25mm ball head arm systems for effortless gear integration. - β€’ **Complete 2-Pack with Spare O-Rings:** Ready for extended dives with backup seals ensuring no compromise on waterproof reliability. ## Overview The MINIFOCUS 4" Double Ball Aluminum Extension Arm (2-pack) is a premium underwater accessory crafted from corrosion-resistant anodized CNC aluminum alloy. Featuring universal 1" ball heads with silicone O-ring friction gaskets, these lightweight, hollow arms provide stable, adjustable connections for strobes, video lights, and diving camera trays. Waterproof and rustproof, they ensure reliable performance in marine environments, making them a must-have for professional underwater photographers seeking versatile, durable gear. ## Description Product description MINIFOCUS Double Ball Aluminum Extension Arm For connecting strobe/video light to underwater arm system Underwater Camera Handle Tray Bracket 2PCS Carbon Fiber Underwater Float Arm 4PCS 1'' Aluminum Ball Clamp Mount 1" Long Ball Clamp Dual Holder Mount 2PCS 1'' Triple Holes Ball Clamp Mount 1'' Ball Adapter with M6 Threaded Stud Comparison 1" Long Ball Dual Clamp Mount 4PCS 1'' Ball Clamp Mount 1'' Triple Holes Ball Clamp MATERIAL Corrosion-resistant aluminum alloy(6061) anodized finish STRUCTURE Spring clamp CLAMP WEIGHT 4.2oz/120g 9.6oz/272g 4.8oz/136g SIZE 4.13 x3.3 x2.2inch 2.4 x2.2 x1inch 2.5 x2.3 x2.2inch PACKAGE INCLUDES Long ball clamp 1" x2 Standard ball clamp 1" x4 Triple holes ball clamp 1" x2 These are suitable for Underwater/Marine use? 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. These are suitable for Underwater/Marine use? 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. Will the small balls at the ends slip? 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. Will the small balls at the ends slip? 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. An extension arm has two length sizes, how should I choose? 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. An extension arm has two length sizes, how should I choose? 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. Review: High Quality - High quality product. Review: Well made, fair price - I liked the fact that this was well made, and the price was as good as I’ve found. No dislikes. ## 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 | | Audio Recording | No | | 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 out of 5 stars 115 Reviews | | Folded Size | 4 inches | | Has Self-Timer | No | | 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 | | Product Dimensions | 1"D x 1"W x 5"H | | Unit Count | 2.0 Count | | Warranty Description | 90 days | | Water Resistance Level | Waterproof | ## Product Details - **Color:** 2PCS 4'' Double Ball Extension Arm - **Brand:** MINIFOCUS - **Item Weight:** 4.1 Ounces ## Images ![4" Double Ball Extension Arm - Image 1](https://m.media-amazon.com/images/I/615qPT7r8OL.jpg) ![4" Double Ball Extension Arm - Image 2](https://m.media-amazon.com/images/I/71wqQ5P-GWL.jpg) ![4" Double Ball Extension Arm - Image 3](https://m.media-amazon.com/images/I/71UREDhWf1L.jpg) ![4" Double Ball Extension Arm - Image 4](https://m.media-amazon.com/images/I/717Qo3k5V2L.jpg) ![4" Double Ball Extension Arm - Image 5](https://m.media-amazon.com/images/I/71DYO0TpaIL.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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ High Quality *by D***Z on August 30, 2025* High quality product. ### ⭐⭐⭐⭐⭐ Well made, fair price *by M***R on September 21, 2024* I liked the fact that this was well made, and the price was as good as I’ve found. No dislikes. ### ⭐⭐⭐⭐⭐ Buen servicio *by A***R on October 25, 2025* Buena calidad y servicio. ## 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, 360Β° 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 --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.ie/products/422502486-4-double-ball-extension-arm](https://www.desertcart.ie/products/422502486-4-double-ball-extension-arm) --- *Product available on Desertcart Ireland* *Store origin: IE* *Last updated: 2026-09-05*