1) Quality is 100% brand new guaranteed 2) Compatible with: Gopro Hero3, Hero2, HD Hero camera 3) Material: plastic 4) Attach your GoPro camera to handlebars, seat posts, ski poles and more 5) Fit 0.75" to 1.57" (1.9cm - 4cm) diameter tubes. 6) You can also clamp to chain stays, small roll bars, bolt heads, windsurfing and kite surfing control bars, or even use to create a handheld boom - any pole that is in the size range above. 7) Clamp to chain stays, small roll bars, bolt heads, windsurfing and kite surfing control bars, or even use to create a handheld boom - any pole that is in the size range above. 8) Help you recording easily when you are on driving 9) The bracket for fixing the camera in the bicycle. even the bumpy road, will not affect the stability of the fixed camera.