Twist Lock Suction Cup Mount with 1/4-20 Camera Threaded Adapter The RAP-B-224-1-366 consists of a 3.3 inch suction cup twist lock base, high strength composite double socket arm and 1 inch ball, connected to a round plate with 1/4 inch -20 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 male 1/4 inch -20 threaded steel stud will connect to any standard female thread found on camcorders, digital cameras and POV cameras. The mount is designed with a RAM 1 inch diameter patented rubber ball and socket system that has adjustment points at both ends of the double socket arm;this allows for almost infinite adjustment and perfect viewing angles. Material: High Strength Composite and Powder Coated Marine Grade Aluminium Ball Size: 1 inch Rubber inch B inch Ball Size