The RAP-B-200-1 consists of a socket at one end that accommodates 1" diameter balls: the other end accommodates octagon buttons. A tightening screw on the side of the arm enables the sockets to clamp firmly on the ball and the button.
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RAM® Composite Double Octagon Button
RAM® Composite Octagon Button with Adhesive
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RAM® Composite Octagon Button with Universal Electronics Plate