The Kirk Quick Release Bridge System for Manfrotto MVH 500 Fluid Video Head replaces the original plate system on your Manfrotto MVH 500, and it enables using Arca-type QR plates on your head. It consists of the bridge mount and the quick release system, and it features three QR mounting positions for the Arca-type QR. This allows you to adjust the rotation of the QR to accommodate your camera or lens without having to remount the bridge. An included aluminum pan locking knob is included so you can replace the plastic knob that comes with your MVH 500 head.