. The Black CABSHELF Standard Universal Server Rack Cabinet Shelf helps to efficiently organize your mission critical computer hardware and accessories by adding a fixed shelf with the capacity to hold up to 20 kg (44 lbs). Universally mountable in any standard front mount 19? server rack or cabinet the rack shelf is constructed of sturdy cold-rolled steel for long-term durability.. Backed by a StarTech.com Lifetime warranty. Heavy duty steel construction44.2 lbs. (20kg) weight capacityMountable in any standard 19? rack or cabinet. .