Have you always wanted your own Secret Passage? or Hidden Door system like that bat cave? This unique patented hinge system is 100% made in the USA, and allows you to design and build your own hidden door. It features the ability to be used for an inswing or out swing door system. It provides a 100% concealed doorway system. Simple to build and install offers a lifetime warranty. Design and build Instructions NOT Included! Murphy Door Hinge system is for the professional who can design and build a cabinet door. NO Cut-list or instructions included or available! This is 100% DIY.