The RAM-B-174-GA32U consists of a double socket arm, hardware for mounting to both brake/clutch reservoirs and rails that are 0.5" to 1.25" in diameter, diamond adapter base and custom high strength composite cradle for the Garmin nuvi 500 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 nuvi mount to your optimum viewing position. The mounting hardware for brake/clutch reservoirs include both standard and metric mounting bolts.