RAM 1" Ball Medium Length Double Socket Arm and 1" Diameter Ball with 1/4-20 Stud for Cameras, Video & CamcordersThe RAM-B-366-201U consists of a 1" diameter rubber ball, connected to a round plate with 1/4"-20 camera thread and standard length double socket arm. The round base contains pre-drilled holes, including the universal AMPS hole pattern. The round plate provides extra support and stability for cameras that rest on top of it. The male 1/4"-20 threaded steel stud will connect to any standard female thread found on camcorders and digital cameras. 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 you to maneuver the mount to your optimum viewing position.