RAM® Long Double Socket Arm for 1.5" Ball BasesThe RAM 201U D, Long length double socket arm, has a socket at both ends that accommodates C Size 1. 5" balls. A single spring inside the arm, keeps the socket open, allowing you to insert the ball in to the socket connection. RAM's socket technology allows for almost infinite adjustment to achieve the perfect viewing angle. Dimensions: Overall Length: 9. 125" Socket To Socket Length: 8"