●Aviation aluminum material, professional diving high-strength hard oxidation treatment arm can prevent seawater corrosion. ●Strong, lightweight, waterproof aluminum construction. Use this ball arm between one ball clamps to extend an arm. ●Unique humanization and professional water-through design, greatly enhance the use of the lamp arm under water. ●Extend diving light arm to connect multiple diving equipment (such as fill light, buoyancy arm, etc.). ●You can use this arm to securely attach camera accessories, monitors, lights, or underwater lighting equipment to your favorite camera system.