Goliton Bike Bicycle Rig Roll Bar Mount Handlebar Seatpost for Gopro Hero4/3+/3/2/1- Black This is the replacement Handlebar / Seatpost Pole / Bike / Roll Bar mount for GoPro HD Hero, Hero2 or Hero3. Attach your GoPro camera with this mount to any roll bar within 3.5cm-6.35cm. A 3way pivot adjustable arm to ensure the angle you need. Weight : 71.8g Material : Plastic, Stainless Steel Other : 3-way Pivot Arm, Long Thumbscrew