RAM X-Grip Phone Mount with Drill-Down Base & Backer Plate (RAM-B-138-UN7-225BU) (sku 50919)RAM X Grip Phone Mount with Drill Down Base & Backer Plate (RAM B 138 UN7 225BU) The RAM B 138 UN7 225BU consists of a 3'' x 3'' steel backer plate, 2. 5" diameter round base, double socket arm and universal spring loaded X Grip cradle for cell phones. Designed into the mount is a 1" diameter patented rubber ball and socket system with adjustment points at the both ends of the socket arm; this with a twist of the arm knob, allows you can move the