Bicycle Camera Mount Clamp - TOOGOO(R)Aluminum Bicycle Handlebar Mount Clamp Adapter 31.8 mm for Gopro Hero 2 3 3+ (red) Color: red Inner Diameter: 30 mm - 31.8 mm Product Size: approx. 5 x 5.5 x 2 cm/ 2.0 x 2.2 x 0.8 inch