The Field Optics Research QR Plate for FVH-450 Video Head is a 3.5"-long sliding quick release plate compatible with heads that use the RC5 quick release system, and quick release plates such as the Manfrotto 501PL. It comes supplied with one 1/4"-20 and one 3/8"-16 camera tie-down screw, and features a locating pin. The plate is slotted to help you adjust your camera on the plate for best balance, and a rubber stopper prevents the captive tie-down screws from escaping from the plate.