Description: Lightweight and high strength Strong corrosion resistance and durable in saltwater circumstance Used for attaching your underwater strobes or dive flash lights by the light holder The arm system make it possible for the photographer to convert the camera setup from horizontal to vertical Great accessories for underwater diving photography lovers Specification: Material: Aluminum alloy Color: Black Ball Diameter: Approx. 1 inch/2.54 cm Total Length: Approx. 4 inch/10 cm Package Includes: 1 Piece Ball Arm Adapter Note: Please allow slightly difference due to manual measurement. Color may be slightly different since different monitor. Thanks!