Go Pro GRBM30 Roll Bar MountRoll bar/tube clamp for mounting your quick-release GoPro camera on to tubes/frames ranging from 1.4" to 2.5" (3.5cm - 6.35cm) in diameter. Perfect for clamping your camera to the radiator cap (both metal and plastic caps) on karts. You can also clamp to bike frames, bumper bars, ski/surfboard racks, or anything else that is in the size range above. Comes with pivoting orientation arms allowing for 3-way adjustability, ensuring you can get the angle you want. Compatible with all GoPro quick-release cameras including the Helmet HERO Wide, Motorsports HERO Wide, Motorsports HERO, Surf HERO, and WIDE HERO cameras.