RAM MOUNTS' RAM-103U-D Double Socket Arm with Round Ball Plate consists of the 1.5 in C size diameter ball and socket system with one open socket end; 2.5 in round plate connects to RAM device holders containing the universal AMPS hole pattern Includes C size long length double socket arm 9.125 in end to end with an 8 in socket-to-socket length; ball and socket technology allows for near-infinite adjustability Made of powder-coated, marine-grade aluminum for durability and reliability in the most demanding environments