TECHTOO SERVER RACK RAILS: Installs in 4-Post EIA/ECA-310 Rack to Mount Any 19" Device such as Network Server or UPS Ideal Replacement for Lost Rails on HPE ProLiant - Dell PowerEdge - Lenovo ThinkSystem - APC UPS - IBM System Server The Universal 4 Post Rack Mount Rails Support a Generous Weight Capacity of 110 lbs. That Can Easily Mount Any 19" Devices The Server Rack Shelf Rails Are HASSLE-FREE to Install and the Network Server Device Securely Rests on the Shelf Rails The Rack Mount Rails Constructed from Cold Rolled Steel for DURABLE USE. Universal 19-inch EIA/ECA-310 Complaint Design with Adjustable Depth: 16-33inch. 1U Network Rack Rail Kit with a 16-33inch Adjustable Depth Allows to Accommodate Various Rack Sizes up to 33 inches Dimensions: 1.75"H x 2.75"W x 20"D - Mounting Hardware Including 8 x M6 Cage Nuts and Screws - Assemble Needed