Made of aluminum alloy and rubber; Three spirit levels for precise positioning; Cork plate; With video pin; Auto locking; The Quick Release Adapter Plate converts a regular screw-on head or tripod/monopod platform into a quick release head; Using a base plate that features 3 bubble levels that easily and accurately level your camera in any position, the quick release assembly is a compact quick release system; For easy use with video and many digital cameras, the plate features a centering video pin.