One embodiment of a drum rack system device of the type having an octagonal rail member (1), has internal muffling or foam (2), attached to a clamping body (3), and is secured with a screw (4). The clamping body (3) is secured to a clamping arm (6) with a pin (5). The clamping body (3) contains housing for a swiveling t-nut (8). A tension rod (9) will pass through a concave washer (10). In addition, a cylinder (11) will pass through a hole in an easy locking lever (12) and the tension rod (9) will pass through and screw into the swiveling hardware (8). The completed assembly will clamp on to a round tube leg rack, allow height adjustability, and fold up with a flip of an easy locking lever. There is a raised-geared teeth (13) design on the top and bottom face of the clamp portions that will interlock at various and precise angles with other geared clamps. Other embodiments are described and shown.