The UNISLDSHF19M is adjustable sliding rack shelf lets you add a vented, sliding shelf with cable management into virtually any 4-post server rack or cabinet. The adjustable mounting depth design allows the shelf to be installed easily into server cabinets with mounting depths from 27.7 (702.2) to 31.6" (802.2mm). The sliding rails also offer a locking mechanism to stop the shelf from sliding out too far or sliding back into the rack before maintenance is complete.