This 21U Rolling Rack is perfect for Modulators, Receivers, Home Theater AV Equipment, Routers, and many other items. Racks includes 3 inch gray non marring wheels with casters pre-installed for you, making your install quicker and easier. It also offer unique side entry knock outs so running wires in through side panel is easy when coming in from the back is not an option. Racks are powdered coated with a flat black finish and easy to assemble. The rack will give your installation a real professional appearance. The rolling rack can accommodate any standard 19 Inch rack mounted hardware or components.