RAM Manubrio U Bolt Supporto a sfera per Garmin GPS Serie 60 pi Altro RAM Handlebar U Bolt Mount for Garmin nuvi 52, 54, 55, 56, 57, & 58 RAM Handlebar U Bolt Double Ball Mount for Garmin nuvi 1690 RAM Mounts RAM B 174 GA55U RAM Motorcycle Mount for Garmin nuvi 52 & 54 Series. 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. 25" in diameter. Also included are black cover caps to be placed over the exposed ends of the u bolt and a composite adapter that can narrow the rail to a minimum width of 0. 5". HARDWARE INCLUDED Assembly Hardware (1) 1 4" 20 U Bolt for . 5" 1" Rails (1) 1 4" 20 U Bolt for 1" 1. 25" Rails (2) 1 4" 20 Nylock Nuts (2) Rubber Caps (1) U Bolt Spacer CLAMP RANGE . 5" 1. 25" diameter SOCKET TO SOCKET LENGTH 3"