The RAM-B-149-GA20 consists of a stainless steel u-bolt base, double socket arm, diamond adapter base and custom high strength composite cradle for the Garmin Rino 520 and 530 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 motorcycle GPSMAP mount to your optimum viewing position. Included in this package is a GPS safety lanyard clip and hardware that will accommodate rails from 0.50″ to 1″ in diameter.