RAM Handlebar U-Bolt Mount for Garmin nuvi 52, 54, 55, 56, 57, & 58 (RAM-B-149Z-GA55U) (sku 54118)The RAM B 149Z GA55U consists of a double socket arm, zinc coated u bolt base, diamond adapter base and custom high strength composite cradle. 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 Rino mount to your optimum viewing position. Included in this package is hardware that will accommodate rails from 0. 50" to 1.