RAM Composite Clamp Mount for the Garmin GPSMAP. Rubber ball and socket technology allows for almost infinite adjustment and perfect viewing angles. High quality composite materials insure your GPS is safe, secure, and within easy reach. The clamp base fits a rail or edge lip from 0.625" to a maximum of 1.25". The mounting base can also accept a second ball giving you the ultimate double ball base. Extra ball not included with purchase of this mount.