Tecmojo 1U Server Rack Rail Depth Adapter kit allows for increasing or decreasing of the mounting depth in your existing server rack by 4 inches. It fits into any standard EIA-310 19" & 23" 2 Post Relay Rack or 4 Post Cabinet. Specially designed for extend your rackmount pointing inward or outward by 4". It is an ideal solution for consolidating your equipment into one space without the need to purchase multiple racks. The kit includes the screws and nuts to mount the brackets to your existing rack. The adapters can also be used for mounting equipment that has high density cabling such as network switches and patch panels. Made from heavy gauge steel, the total weight capacity of the 1U server rack depth adapters is 20lb (9kg) for installation on 2 post rack or 60lb (27kg) for 4 post installation. These adapters come in pairs with installation hardware and are available in a variety of sizes.