RAM Mounts RAM Double Socket Arm for 1in. Ball Bases RAM-B-201UOverall Length: 3. 69in. Socket To Socket Length: 3in. The RAM B 201, standard double socket arm, has a socket at both ends that accommodates 1in. ball bases. A single spring inside the arm opens the end sockets, allowing you to pivot the ball and socket connection. This socket technology allows for almost infinite adjustment and perfect viewing angles.