The UNISLDSHF19 is 19" vented adjustable mounting depth sliding server rack cabinet shelf offers a simple way to install non rack mountable equipment into a server cabinet or open server rack. Offering a weight capacity of up to 50lbs (22.7kg), the sliding rack shelf features a ventilated, cold-rolled steel shelf on two locking adjustable rails which allow the shelf to be installed into cabinets or racks with mounting depths from 20 (510) to 30" (744mm). The locking feature locks the shelf 3/4 of the way out, preventing the shelf from accidentally falling out of the rack or sliding back in before maintenance is complete.