The RAM-B-166-237U, twist lock suction cup mount consists of a 3.25" suction cup locking base and universal camera base. 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. Simply attach the suction cup base to the windshield of your vehicle for an easy and safe way to view your camera. High quality materials ensure your electronic camera is safe, secure, and within easy reach. RAM’s patented design also dampens shock and vibration helping to extend the life of your camera. The universal camera and camcorder base consists of a 1" diameter rubber ball, connected to a 1/4-20 camera thread. The male thread matches most standard camera and camcorder female threads found on the bottom of the camera. Material: Powder Coated Marine Grade Aluminum Ball Size: 1" Rubber Ball "B" Size