RAM Mount Universal X-Grip Holder Composite Surface Mount [RAP-B-138-UN7]RAM Mount Universal X Grip Holder Composite Surface Mount Part #: RAP B 138 UN7 The RAP B 138 UN7 consists of a double socket arm, 2. 5" round base base and universal spring loaded X Grip holder 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 suction cup X Grip mount to your optimum