Houdini Concealed Sliding Door Hardware Kit While traditional flat-track barn door hardware has an exposed wheel that rolls along a track, the Houdini Concealed Barn Door Hardware Kit hides the hardware behind the door for a sleek, modern, and minimalist look. A track mounted to the back of the door interfaces with rollers fixed to the wall to allow the door to slide. Wheels on the bottom of the door carry the full weight of the door and allow it to roll back and forth effortlessly. The kit comes with soft close mechanisms that bring the door to a controlled stop in both the open and closed position. Can be used in a single or double-door setup. Door is not included.