Accommodating components too wide to fit the 17-3/8" inside width of standard rackshelves, these shelf systems fit units up to 22-1/2" wide, and either bolt into millwork or to the mounting angle of standard rackrail. Occupies 3 rackspaces, the WUSS system comes complete with a pair of ears, a bottom, and appropriate assembly hardware. 50 lb. Weight Capacity. Depth: 20-1/2".