... perforated steel, Perforated sheet metal, perforated screen, perforated plate, perforated panel, perforated metal piece, perforated metal sheets, ... sheets, galvanized sheets, plain steel plate, iron plate, brass /copper plate, aluminum plate, phosphor bronze plate, aluminum-plastic, nickel, titanium, ... also be used in building wall power station .factory ceiling wall plate and other source of noise in ...