RAM MOUNTS 1" Ball Long Length Double Socket Arm with Diamond Base. The RAM-B-103-C-238U consists of a diamond base and LONG double socket arm that will accept 1" ball bases. The diamond base measures 2.43" x 1.31" and contain two holes 1.912" from center to center, positioned at both ends of the diamond base. The hole pattern found on the diamond base will connect to many RAM cradles, as well as third party cradles including mounts with the industry standard AMPS hole pattern. Designed into the mount is a 1" diameter patented rubber ball and socket system with adjustment points at both ends of the socket arm; this with a twist of the arm knob allows for you to maneuver the mount to your optimum viewing position.