The Ram Mount RAP-B-201U-A has a socket at both ends that accommodates 1" ball bases. This Short Double Socket use technology that allows for almost infinite adjustment and perfect viewing angles. Dimensions: 3.00" h x 2.00" w x 2.00" l, .10 pounds. High Strength Composite. Ram Mount Composite Short Double Socket Arm for 1-Inch Ball Bases make from plastic so it's lighter than the other metal piece.