The RAM-101-G4 consists of a 6 inch double socket arm, 2.5" diameter round base with the universal AMPS hole pattern and round adapter base that attaches directly to the back of the Garmin echo™. Designed into the mount is a 1.5" diameter patented rubber ball and socket system with adjustment points at both socket ends of the arm; this with RAM's rubber ball and socket technology allows for almost infinite adjustment and perfect viewing angles. Included is hardware that is used to attach the Garmin echo™ to the RAM Mount. See other compatible Garmin devices under "compatibility".