The RAM-201 RAM Mount Powder Coated Marine Grade Aluminum Standard 4.63 inch Double Socket Arm has a socket at either end to allow a 1.5 inch diameter ball accessories to be connected.

A tightening screw on the side of the arm enables the sockets to clamp firmly to a RAM 1.5 inch 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.