Odyssey ARSCLP04 4 Space Large Perforated Security Cover Rack Accessory 4U Rack Spaces (7") Sleek Black Exterior Raised Design for Covering Protruding Knobs and Switches Provides Security to the Covered Gear Perforated Designs Allows Ventilation and Visual Gear Inspection Fits Standard Racks With Pre-tapped 10-32 Rack Screw Holes