RAM Drill-Down Mount for Garmin GPSMAP 60 Series + More (RAM-B-138-GA12U) (sku 54768)The RAM B 138 GA12U consists of a 2. 5" diameter round base with the universal AMPs hole pattern, standard length double socket arm, diamond adapter base and high strength composite cradle for the Garmin GPSMAP. 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