The RAP-B-200-12U, double socket swivel arm, consists of double 1" diameter open ball sockets with a 360° rotation point at the center of the arm. A tightening screw on the side of both sockets enables the arm to clamp firmly to the RAM rubber ball accessories. When loosening the side screw on either arm, the corresponding ball can be easily adjusted or removed from the ball if required. The rubber ball and socket at each end, and a central pivot point provides unsurpassed adjustability. The RAM ball sockets maximize ball coverage for optimal fit.