The RAM-B-252-A-326U consists of a 2.25″ x 0.875″ base with 11mm hole, SHORT double socket arm and EZY-Mount quick release adapter kit. The base is often used on motorcycles, attaching to the mirror frame, the main brand of bike is BMW. This part fits well on many handlebar pinchbolts with a washer (base is 5mm thick). The EZY-Mount adapter kit utilizes a quick release male to female union, these mounts are absolutely perfect for those who want the most secure, yet rapid release and portable kit possible. How does it work? Mate an EZY-Mount male or female component to any RAM cradle or device with the standard AMPS hole pattern. Align the two parts and snap into place. To release, push back the release tab and go. The mount is designed with a RAM 1″ diameter patented rubber ball and socket system that has adjustment points at both ends of the double socket arm; this allowing for almost infinite adjustment and perfect viewing angles.