RAM Drill-Down Mount for Garmin nuvi 50 & 50LM (RAM-B-138-GA50) (sku 54916)The RAM B 138 GA50 consists of a 2. 5" diameter round base with the universal AMPS hole pattern, double socket arm, diamond adapter base and high strength composite cradle. 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. HARDWARE INCLUDED Assembly Hardware SOCKET TO SOCKET LENGTH