A 19-inch rack is a standardized frame or enclosure for mounting multiple pieces of AV equipment. Each piece of equipment (amplifiers, CD decks, lighting dimmers etc. ) has a front panel that is 19 inches (482.6 mm) wide, including edges or ears that protrude on each side which allow the module to be fastened to the rack frame with screws. 19 inch rack cases and flight cases with shockmount and mixer-top options.