Color Black Brand OUMILY Material Aluminum alloy + ABSS Quantity 1 Piece Type OthersMounting bracket Retractable No Ring Diameter 3.2cm Max.Load 3 kg Other Features Max. Load 3kg Max. Height: 3.2cm Min. Height: 3.2cm; Inner diameter: 30mm~32mm; CNC computer machining; More stable with 6061 aluminum; Especially designed for Gopro Hero2/3/3+SONY AS15 / AS30; Easy installation to bikes. Packing List 1 x Mounting bracket 1 x Connector 1 x Screw