RAM Double Socket Swivel Arm for 1" Ball BasesThe RAP-B-200-2U consists of double 1" diameter open ball sockets with a 360 degree rotation point at the center and a connecting swivel joint that rotates forward and back 180x. 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. Dimensions: Overall Length: 6.25"Socket-To-Socket Length: 5" Material: High Strength CompositeBall Size: 1" Rubber Ball "B" Size Note: The "U" in the part number reflects product packaged in poly bag.