ATian(TM) Ride Hero Handlebar Seatpost Pole Mount for Gopro Hero 1 2 3 Camcorder Gopro Ride Hero Handlebar Seatpost Pole Mount (Max for 4cm diameter) Olny 1 Bicycle Handlebar / Seatpost Clamp included in this list Attach your GoPro camera to handlebars, seatposts, ski poles and more. Fits 0.75' to 1.4' (1.9cm  3.5cm) diameter tubes. You can also clamp to chainstays, small roll bars, bolt-heads, windsurfing and kitesurfing control bars, or even use to create a handheld boom  any pole that is in the size range above. Compatible with ALL HERO3, HERO2, and HD HERO Original Cameras. Max for 4cm diameter