For M8 handlebar bolts, the RAM Motorcycle Handlebar Clamp Base will replace the existing bolt with a 25.4mm B size ball. This rubber ball base provides shock and vibration damping, and is compatible with a wide variety of B size RAM double socket arms and device holders. This motorcycle handlebar base will work with any motorcycle that features an 8mm bolt or smaller on its structure. A smaller bolt can be used, though the load capacity decreases with the bolt size. The clamp base is made of marine-grade aluminum for durability and reliability in the most demanding environments.