RAM Twist-Lock Suction Cup Mount for Garmin nuvi 52, 54, 55, 56 & 58 (RAM-B-166-GA55U) (sku 54885)The RAM B 166 GA55U consists of a double socket arm, 3. 3" twist lock suction cup base, diamond adapter base and custom high strength composite cradle. The suction cup, twist lock base is designed to have a strong hold on glass and non porous plastic surfaces, including adhesive disks. 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