By day, it's a simple, elegant shelf that displays photos and other knickknacks. By night, it's a safety net that helps you protect your family from an intruder. The 24" solid wood shelf plays double duty as knicknack holder and concealment area. Simply cut the foam insert to the desired cut-out shape, secure it to the shelf using the two-sided tape, then mount the shelf to a wall using the included hardware. The kit includes: 24" shelf, foam insert, two mounting screws & anchors, lock key, and instructions.