StarTech.com Server Rack Cabinet Shelves - StarTech.com UNISLDSHF19, This 19-inch Server Rack Cabinet Shelf from StarTech.com has an adjustable mounting depth, sliding operation and is vented and offers a simple way to install non rack-mountable equipment into a server cabinet or open server rack. With a weight capacity of up to 22.7kg, the sliding shelf is constructed from cold-rolled steel on two locking adjustable rails. These allow the shelf to be installed into cabinets or racks with mounting depths from 510 to 744mm. The shelf can be locked 3/4 of the way out, preventing it from accidentally falling out of the rack or sliding back in before maintenance is complete. It is backed by a StarTech.com lifetime warranty. StarTech.com UNISLDSHF19 19\" Universal Sliding Vented Shelf