The RAM-B-309-1 (single 1" ball) and RAM-B-309-2 (double 1" ball) mount bases are part of the RAM 309 Clutch/Brake Motorcycle Family. These bases connect to your handlebar clutch/brake clamp, left or right side, and holds one or two 1" diameter mounting balls. The base fits the control clamps on your motorcycle with 40mm x 6mm stainless steel hardware, provided in the kit.