The Velbon QB-F51L Quick Release Plate is the long sliding quick release plate for the FHD-51Q Fluid Head. It features a 1/4"-20 camera screw, with an adjustment range of 4.3" (110mm).
A quick release plate can be kept attached to the camera's base at all times and allows the user to quickly and easily attach or remove the camera from the tripod without having to waste time fumbling with the threaded mount.