brand new and high quality Descirption: Features: Ball mount double socket arm for motorcycle , bicycle. Works with all standard 1 inch / 25mm ball for head adapters. Aluminum alloy made, sturdy and durable to use. Easy to use, just tightening screw on the side of the arm enables the sockets to clamp the ball firmly. When loosening the side screw, the arm opens, it allows you to connect or disconnect the ball from the socket completely. Specification: Material: Aluminum Alloy Size: 95mm/150mm(Optional) Ball Head: 25mm/1 inch Notes: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1x Double Socket Arm