The RAM-B-102U-A consists of a short double socket arm and two diamond bases. The diamond bases measure 2.43″ x 1.31″ diamond base 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 bases 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 socket ends of the arm. Material: Powder Coated Marine Grade Aluminum Ball Size: 1″ Rubber „B” Ball Size Note: The „U” in the part number reflects product packaged in poly bag.