The RAM-B-177-347U consists of a glare shield clamp base, short double socket arm and 2" x 1.7" rectangular base that contains the universal AMPs hole pattern. This mount is designed to mount to the lip edge of a flat surface up to 5/8" thick. Popular mounting edges include a car side window edge lip or glare shield on an airplane. The base has two composite bolts that, when tightened, clamp the base to the lip surface. A RAM 1" diameter rubber ball is connected to the base allowing you to connect a RAM 1" diameter arm socket and connection plates to create the perfect mount for your application. 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.