The RAM-B-166-G4 consists of a 3.3" suction cup twist lock base, double socket arm, 2" x 1.7" plate and custom hardware 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. Simply attach the suction cup base to the windshield of your vehicle for an easy and safe way to view your handheld device in your vehicle. The included hardware allows your device to attach directly to the mount.