The 7.5" Kirk LRP-1 Multipurpose Rail provides a sliding long aluminum plate solution to any head equipped with an Arca-type clamp. Its dual dovetail plate enables attachment to any Arca clamp or head and the topside dovetail allows a flash or other accessories with an Arca connection to be attached as well. It provides about 7.5" movement range, ideal for fine-tuning during macro and close-up photography. In addition, it also features a 90° swiveling Arca-type quick release clamp on top, which now allows bidirectional control. Once you have positioned the clamp in the desired direction, the included hex key stores inside the clamp.