For RAM-B-367U Motorcycle Handlebar Clamp Base Mount Features: Motorcycle handlebar clamp base with 1" ball and M8 bolts. By turning a single knob, the adjustment arm is treated with a rubber ball by dampening shock and vibration. Simply clamp the easy-to-install ball base to the top of the motorcycle handlebar and you're done. Attachment: Motorcycle handlebar top clamp, a bike uses a m8 with bolt. Description: Material: marine grade powder coated aluminum Ball size: 1" rubber ball" b" size Size: approx. 35 x 15mm Color: black - silver Package included: 1 x 1" rubber ball 1 x m8 x 55 bolt (1.25 thread pitch) 1 x m8 x 60 bolt (1.25 thread pitch) 1 x m8 x 65 bolt (1.25 thread pitch)