1. Durable Construction: The 7" Double Ball Aluminum Alloy Extension Arm is crafted from aircraft-grade aluminum alloy with a hard oxidation treatment, ensuring resistance to deep-sea corrosion. Its lightweight skeletonized design minimizes water resistance, enhancing your underwater photography experience. 2. Versatile Compatibility: Measuring 7 inches (17.78 cm) in length with a 1-inch (25 mm) sphere size and weighing just 2.39 oz (68 g), this extension arm is compatible with all arm systems featuring a 25 mm ball head. Easily attach multiple dive rigs such as fill lights and buoyancy arms by extending the arm. 3. Enhanced Stability: The 1-inch ball head includes a rubberized O-ring that reduces friction during attachment, providing a stable and secure support for your lighting system. This feature prevents movement or shaking, making it ideal for capturing clear, vivid images while diving, snorkeling, or engaging in other underwater activities. 4. Adjustable Positioning: Featuring butterfly clips, the double ball extension arm allows for multi-directional attachment of flash or video lights. With a full 360-degree rotation, you can easily adjust the light angle for optimal illumination, helping you achieve the perfect shot every time. Use Scenarios: - Capture stunning underwater images while scuba diving with stable lighting support. - Illuminate your subjects during snorkeling trips for clearer, more vibrant photos. - Use in conjunction with various dive rigs to enhance your underwater photography setup.