Perfect connect with the ball head to plug in the fill light, flashlight, camera & waterproof housing or action camera when normal shooting and underwater photography. Features: Made of hard coat anodized aluminum alloy, lightweight, durable and anti-corrosion, can rotate 360 degrees. This standard clamp attaches two 1-inch diameter balls. Thicker plates provide the perfect combination of strength and range of motion. Plates are spring-loaded for easy assembly and breakdown of your arm system. Multi-position free connection and fixation, have more freedom to adjust the flash direction. The ball clamp is used to attach 2 arms, base adapters and strobes together. The clamp mount for 1" ball, compatible with most of the arm and camera. Specifications: Material: Aluminum alloy Color: Black Screw Interface: 1/4" Product Size: 2.5 * 2.17 * 0.98in Net Weight: 58g / 2.1oz Package Size: 8.4 * 7.5 * 3.8cm / 3.3 * 3 * 1.5in Package Weight: 78g / 2.8oz Package List: 1 * Butterfly Dual Ball Clamp Mount