The 7.5" Kirk LRP-3 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, the dual clamp enables you to mount to the rail in 90° intervals for a camera or a collard lens, which now allows bidirectional control. Once you have positioned the clamp in the desired direction, the included hex key stores inside the clamp.