The Kirk LRP-1 Long Rail Quick Release Plate provides a sliding long plate solution to any head equipped with an Arca-type quick release clamp. It provides about 6.5" (16.5cm) 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 bi-directional control.