The RAM-B-177U consists of a glare shield clamp base, short double socket arm and diamond base adapter. The RAM-B-177U 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 hole pattern found on the diamond base adapter will connect to most RAM cradles.