The RAM-B-179U consists of a 1" diameter ball base, connected to a 2.25" x 0.875" base with 11mm hole, double socket arm and diamond base adapter. This mount is often used on motorcycles, attaching to the mirror frame, most commonly found on BMW motorcycles. as well as many handlebar pinchbolts with a washer (base is 5mm thick). The 2.43" x 1.31" diamond base contains two holes 1.912" from center to center, matches the industry standard AMPS hole pattern and will connect to a large variety of RAM Mount and third party cradles. 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.