Gator Rackworks hinged wall mounted rack with 9U, 21" deep, steel front door. Hinged back double section welded frame construction. 18 gauge removable side panels with spring latch. 18 gauge SPCC cold rolled steel top and bottom. Fan ready perforated top. 11 gauge drilled and tapped front and rear rack rails. Rack U number printed on the rack rails. 10/32 rack screws. 1/2", 5/8", 3/4", 1"1 and 1 1/2" cable entry knockouts on top and bottom. 5/8" knockout design to be used for VHF/UHF antenna. 10" x 10" rear access knockout for cable entry.