RAM Mounts 1" Ball Medium Length Double Socket Arm with 3.3" Diameter Suction Cup Twist-Lock Base. The RAM-B-166-103U consists of a 3.3" suction cup twist lock base and STANDARD length double socket arm for 1" ball diamond bases. The suction cup base is designed to have a strong hold on glass and non-porous plastic surfaces, including RAM adhesive disks. The mount is designed with a RAM 1" diameter patented rubber ball and socket system that has adjustment points at both ends of the double socket arm; this allowing for almost infinite adjustment and perfect viewing angles. The socket arm is compatible with all 1" ball bases and adapters.