Universal Buying(TM) Gopro Tripod Mount,Bike Bicycle Motorcycle Aluminum Handlebar Roll Bar Mount Adapter for GoPro HD Hero 4/3+ /3/2/ 1 /Sports Camera Diameter: 30mm - 31.8mm Material: CNC Aluminum Alloy Handlebar mount locks securely around any 22.2 mm handlebar. Anti-twist locking screws match the international standards It is suitable for Gopro Hero 1 2 3 3+ 4 Session and other sport digital camera.