1. quality, robust, and durable construction: This underwater extension arm is made of aluminum alloy, which is waterproof, rustproof, and corrosionresistant to withstand harsh underwater environments. The hollow design is lightweight, making it easier to handle and reducing drag when used on the seabed. The dualball carbon fiber arm provides buoyancy, enhancing the stability of lighting for underwater photography, spotlighting, balancing your camera flash illumination, and improving the professional quality of your underwater photography and video setup. 2. Versatile application: Ideal for diving, snorkeling, and outdoor use, this extension arm enhances your underwater lighting system, offering positioning for video lights, strobes, or dive camera trays. The aluminum alloy underwater extension arm is designed for versatility and durability, providing a solution for underwater photographers, diving professionals, diving enthusiasts, snorkelers, and spearfishers. It is for underwater lighting systems. 3. Multifunctional underwater extension arm: The 10.2 cm underwater extension mount provides better stability for your dive camera accessories and the freedom to adjust the lighting angle for capturing the photos and videos. The ideal underwater extension arm for amazing underwater imagery. 4. Easy installation and compatibility: The dual 2.5 cm ball extension arm design is lightweight and simple to install and operate. The twoball extension arm is compatible with all 2.5 cm ballhole clips and can connect with other diving accessories, offering multiple connection points.