RAM Mount Double Socket Arm w/Dual Extension Ball Adapter [RAM-B-201-201U]Double Socket Arm with Dual Extension & Ball Adapter The RAM B 201U, Medium length double socket arm, has a socket at both ends that accommodates B Size 1" balls. A single spring inside the arm, keeps the socket open, allowing you to incert the ball in to the socket connection. RAM's socket technology allows for almost infinite adjustment to achieve the perfect viewing angle. Featuring: Dimensions: Overall Length: 3. 69" Socket To Socket Length: 3"