The InvisiDoor can be used to conceal a seldom used room, create a hidden safe room, or turn a door into a functional storage and display area. Sized to fit standard openings for a 36" door. Simple installation with a unique pivot hinge and it can be hinged left or right as an inswing or outswing.(Instructions included). Made with only premium plywood and domestic hardwoods, it features a flexible design with one fixed shelf, and three adjustable shelves.