RAM Twist-Lock Suction Cup Short Mount with 1-4"-20 Threaded Stud (RAM-B-166-A-237U) (sku 54863)The RAM B 166 A 237U consists of a 3. 3" suction cup twist lock base, SHORT length double socket and 1" ball that contains a 1 4" 20 male camera thread. 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