Tripp Lite's 50U Heavy-Duty 4-Post Open Frame Rack helps IT managers organize their equipment array and provides fast, easy access to installed IT equipment. The SR4POST50HD is a simple solution for housing IT equipment in secure environments and other areas that don't require a lockable rack solution. This 50U rack features heavy-duty cold-rolled steel construction with a black powder-coated finish for durability. It supports stationary loads up to3000 lb. The SR4POST50HD comes with all the hardware required for assembly and has a self-squaring design with bolt-down provisions. For high-density applications, multiple units can be bolted togetherside by side. The open design of the SR4POST50HD provides unobstructed airflow and easy access to equipment and cabling. It has numbered, square-hole mounting positions for easy installation of standard 19-Inch rack equipment. The SR4POST50HD supports equipment depths up to 35 Inches. This rack also accommodates toolless button-hole mounting for vertical PDUs and cable managers. The optional SRcastorHDKIT Heavy-Duty Rolling castor Kit adds mobility to the SR4POST50HD. The rack supports rolling loads of 1360 kg (3000 lb.) The SR4POST50HD also supports optional side panels with the SR50SIDE4PHD, a set of two half-size side panels that add a finished look to end-of-row racks in your data center.