These Rack Model 151 server racks are compatible with Dell, HP and IBM servers and computers. They are also compatible with most other standard brands as well. These server racks meet the EIA standards for 19" server racks. The fully enclosed server racks range in size from an 18U server rack to a 42U server rack, perfect for most any server room or data center. The Rack Model 151 also ships fully assembled and ready to roll into place and start using immediately. Security has been addressed as well, with our locking front and back doors and locking side panels. Latches can be upgraded for even more security as well!