11in ball can be used to connect dual hole ball clamp mount or other magic arm bracket. 2It brings convenience for the attachment of additional accessories, such as flash, video lights. 31/4in screws on the bottom fit for the standard for most underwater photography system. 4Ergonomic handle grip is comfortable for grip and easy to operate. 5It is made of premium aluminum, lightweight and sturdy, durable to use. Features: 1in ball can be used to connect dual hole ball clamp mount or other magic armbracket.It brings convenience for the attachment of additional accessories, such as flash, video lights.1/4in screws on the bottom fit for the standard for most underwater photography system.Ergonomic handle grip is comfortable for grip and easy to operate.It is made of premium aluminum, lightweight and sturdy, durable to use.Specification: Condition: 100% Material: Aluminum Color: Black Screw: 1/4in Ball Diameter: Approx. 2.5cm / 1.0in Size: Approx. 28 * 18.5cm / 11.0 * 7.3in Weight: Approx. 639g Packing List: 2 * Grips 1 * Connection Tray 1 * Wrenches 5 * Screws Other devices on pictures are not included.