The RAM 4″ rubber suction base mount consists of the 1″ dia. ball and socket system with RAM plastic cradle for the Garmin Rino 110, 120 and 130 Series. The rubber suction cup base has a 1.0″ diameter rubber ball connected at right angles. The suction cup is designed to hold on any smooth non-porous surface, but for best result, mount the suction cup on a glass surface.Note: Not compatible with the 520 and 530 Series. Part number reflects product packaged in clear clam shell for store shelf display. For additional specifications, see components and drawings tabs.