The Gator Cases 1U Vented Sliding Rack Shelf (13.8" Deep) is designed to be installed in a standard 19" rack. It enables you to add a storage shelf to a rack. Air passageways have been cut into its 16 gauge steel to help keep your equipment ventilated. The shelf conveniently slides out giving you easy access to hidden equipment, or it can be used as a pull-out workspace. The steel used to construct this shelf has been cold rolled to give it additional strength. The rear of the shelf is flanged for added rigidity.