The Double Socket Swivel Arm For 1" Ball Bases consists of double 1" diameter open ball sockets with a 360° rotation point at the center and a connecting swivel joint that rotates forward and back 180°. The rubber ball and socket at either end, and a central pivot point provides unsurpassed adjustability. The RAM ball sockets maximize ball coverage for optimal fit. Detailed Specifications: Dimensions: Overall length: 6.25" / Socket-to-socket length: 5.5". Material: High-strength composite Ball size: 1" rubber ball "B" size.