The SRW21UG SmartRack 21U Low-Profile Switch-Depth Wall-Mount Rack Enclosure Cabinet is ideal for storing EIA-standard 19-inch rack equipment in network closets, retail locations, classrooms and other areas with limited floor space where you need equipment to be secure, organized and out of the way. Constructed from heavy-duty steel with a durable black powder-coated finish, the cabinet has a maximum load capacity of 200 pounds. To ensure your valuable equipment stays secure, the side panels and front door lock. The top, bottom and removable side panels are vented, which allows air to flow freely through the cabinet to keep equipment cool. The reversible front door can open left or right by rotating the cabinet 180° before mounting. Convenient top and bottom ports allow easy cable routing through the cabinet. The SRW21UG comes fully assembled and ready to mount to the wall (or use Tripp Lite's optional SRCASTER caster kit to make it a mobile rolling rack). Square and 12-24 threaded mounting holes and numbered rack spaces make equipment installation easy. The vertical mounting rails adjust in 7/8-inch increments to accommodate equipment up to 16.5 inches deep, such as network switches and patch panels.