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. Measuring 5-1/4? high, this shelf saves room by requiring no rackspaces. The WUSS system comes complete with a pair of ears, a bottom, and appropriate assembly hardware.