Know your gear
The RAM-B-252U marine grade aluminum base consists of a 1" diameter ball and 2.25" x 0.875" base with 11 mm hole. This part is often used on motorcycles, 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 5 mm thick).