Rack mounted shelves shall be one, two, and three rack spaces and 19 inches wide. The shelves shall be front mounted, slide-out or cantilevered versions. Keyboard shelves shall accommodate either 16.5 inch or 20 inch wide keyboards and a mouse. The keyboard shelves shall fit in a 2 RU rack space. Center mount cantilevered shelf Includes front and rear shelf to mount on standard 3" channel racks Heavy load rating Support non-rack mountable equipment up to 250 lbs. Keyboard shelf versions include pull-out drawer with slide-out mouse tray Storing keyboards inside of shelf when not in use make an aesthetically pleasing rack