Star Tech. com 1U 7in Depth Universal Fixed Rack Mount Shelf - 33lbs / 15kg The CABSHELF1U 1U (Black) Universal Fixed Server Rack Cabinet Shelf lets you add a compact fixed storage shelf to any standard 19-inch server rack or cabinet with front mount options. Constructed using SPCC commercial grade cold-rolled steel, this durable fixed rack shelf can hold up to 15kg (33lbs) of equipment - a perfect solution for storing small form non-rackmount equipment, tools, peripherals or accessories in your rack, to keep them readily accessible.