The RAM-B-252U marine-grade aluminum ball base consists of a 1" rubber ball and 2.
The RAM-B-252U marine-grade aluminum ball base consists of a 1" rubber ball and 2.25" x 0.875" base with 11mm hole. This part is often used on motorcycles by attaching to the mirror frame. The main brand of bike for the RAM-B-252U is BMW. This part fits well on many handlebar pinchbolts with a washer (base is 5mm thick).
