Increase peripheral and equipment accessibility with this vented sliding cabinet shelf. Compatible with StarTech.com 4POSTRACKBK. 2U Sliding Server Rack Shelf. 50lbs (22.7kg) Weight capacity. 24in (610mm) Deep sliding shelf. Mounting depth adjustable from 20.129.3in (510744mm). Universal rack shelf fits standard 19in wide server racks or cabinets. Sliding shelf for storing networking devices KVM switches tools and other equipment in your server room or office.