RAM Mounts Brake / Clutch Base The Ram-B-309-1U connects to your handlebar clutch/brake clamp, left or right side, and holds one 1 diameter mounting ball. The base fits the control clamps on your motorcycle with 40mm x 6mm stainless steel hardware, provided in the kit. Features: Base fits the control clamps on motorcycle Hole centers have a minimum width of .94 and a maximum of 1.58