The phot r 25 roll cage mount with 3 way pivot arm for gopro hero allows you to attach your gopro to roll bars tubes and more fits 14 to 25 35cm to 635cm diameter tubes perfect for clamping to the metal or plastic radiator cap of karts or to bike frames bumper bars roof racks and the 3 way pivot arm allows adjust ability to ensure you can get the angle you want clamps to any 14 to 25 35cm to 635cm diameter tubes mounts to roll bars bike frames roof racks and more m