Compatible with GoPro action camcorders Mounts camera to bike handlebars or seat post It can be fixed firmly on your  bicycle and easy for you to install. Its excellent function is holding Your GoPro Cameras and lets them record the action conveniently Compatible  with 0.75inch to 1.4inch (2cm to 3.5cm) diameter tubes, such as roll bars, bolt-heads, control bars (any poles that is in the size range above). Material: ABS plastic Fits handlebars with 17MM-37MM(below 4cm) Size:80mm x 80mm x 35mm GoPro Bike Handlebar Mount - Black Capture your cycling and mountain biking adventures with the XTGP01 GoPro Bike Mount. Attach a GoPro to your bicycle handlebars or any other tube up to 40 mm in diameter and record your greatest moments on- or off-road. With a simple design, once the XTGP01 Handlebar Seatpost Mount is in place you can relax knowing everywhere you ride is being captured. The XTGP01 is not just for bicycles. It can be attached to ski poles, pipes, branches and more, giving great versatility wherever you are and whatever you're doing.