Ram Mount Composite Twist Lock Suction Cup with Double Socket Arm and Diamond Base Adapter The RAP-B-166U consists of a double socket arm, 3.25" suction cup twist lock base and diamond base adapter 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 Allows for almost infinite adjustment and perfect viewing angles The hole pattern found on the diamond base adapter will connect to most RAM cradles