1、The clamp mount for 1in ball, compatible with most of the arm and camera. 2、Made of hard coat anodized aluminum alloy, lightweight, durable and anti-corrosion, can rotate 360 degrees. 3、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. 4、Multi-position free connection and fixation, have more freedom to adjust the flash direction. 5、The clamp mount for 1-inch ball, compatible with most of the arm and camera. 6、The ball clamp is used to attach 2 arms, base adapters and strobes together. 7、The clamp mount for 1\" ball, compatible with most of the arm and camera. 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 1 * Butterfly Dual Ball Clamp Mount