The RAM-B-138-GA33 consists of a double socket arm, 2.5″ diameter round base with the universal AMPS hole pattern, diamond adapter base and custom high strength composite cradle for the Garmin nuvi 1100/1200 series. Designed into the mount is a 1″ diameter patented rubber ball and socket system with adjustment points at the base and cradle. With a twist of the arm knob, you can move the flat surface nuvi mount to your optimum viewing position.