Wall plate is of type 430 stainless steel, magnetic. Brushed finish. Less corrosion-resistant than type 302, but ideal for general service in high abuse applications in industrial plants, commercial and industrial buildings. Strap mount. Packaged in protective film, with finish-matching screws. Can be silk-screened or engraved and custom punched with over 300 opening styles. Nominal thickness 0.032 inch.