Description: Multi-purpose thread holder with 25mm / 1'' ball adaptor. It can be use for holding video camera, GPS, cell phones, MP3 players and other compact electric devices. Quick release design,rotate the button to install and remove. Anti-slip design to protector your device. High quality ebonite and secondary rubber coating hardware, sturdy and durable. Fixed it on the tube between 16mm-38mm in diameter. Specification: Material: Stainless steel + engineering nylon + soft glue Color: Black Ball Head Diameter: 25 mm / 1 inch Height: 96.7 mm / 3.81 inch Width: 33.3 mm / 1.31 inch Package Includes: 1 Piece Motorcycle Ball Adapter