This accessory is used with a 1/4 inches female threaded screw tripod mount adapter to secure the camera to a tripod. Fit for 1/4" male threaded screw camera accessories.SpecificationColor: BlackMaterial: Aluminum Alloy (Body), Rubber (Bottom)Outer Diameter: 20mm/0.79inchInner Diameter: Female thread 1/4 inchesHeight: 6mm/0.24inchPacking List: 3 x Aluminum Washer with Rubber PadAdvantage Advantage: Made of aluminum alloy, strong and durable.The anti-scratch rubber pad prevents the equipment from being scratched.Instruction Insert the female thread washer into the 1/4 male thread screw. Rotate the aluminum pad to rotate the camera device.NoteRecommended for camera motorcycle mounts, which are anti-shock, and safer than ordinary plastic.