StarTech.com Adjustable Depth Shelves - StarTech.com ADJSHELFHDV, This adjustable heavy duty vented rackmount shelf from StarTech.com can be used to add an adjustable shelf to most standard 19in server racks or cabinets for storing large, non-rackmount pieces of equipment, heavy tools or peripherals. The shelf can be adjusted from 19.5in to 38in mounting depth to fit your rack. Constructed using 1mm SPCC commercial grade cold-rolled steel, it can hold up to 113kg of equipment. StarTech.com ADJSHELFHDV Adjustable Depth Fixed Shelf - Heavy Duty - Vented