The 3-1/2"double socket arm has a socket at either end to allow a 1.5" diameter ball accessory to be connected. A tightening screw on the side of the arm enables the sockets to clamp firmly to a RAM 1.5" diameter ball. When loosening the side screw, a single spring inside the arm opens the sockets allowing you to pivot the ball and socket connection or completely disconnect the ball from the socket.

The arm length is 2-1/4" when measured from socket center to socket center. The total length of the arm is 3-1/2"".