RAM Handlebar U-Bolt Double Ball Mount with 1-4"-20 Threaded Stud (RAM-B-149Z-A-237U) (sku 54864)The RAM B 149Z A 237U consists of a zinc coated u bolt base, short double socket arm and 1" diameter rubber ball, connected to a 1 4" 20 camera thread. Designed into the mount is a 1" diameter patented rubber ball and socket system with adjustment points at both ends of the socket arm; this with a twist of the arm knob, allows for infinite articulation and optimum viewing angles. The male thread matches most standard camera and camcorder female