Steel City� is the industry-leading product line of metallic switch and outlet boxes used in electrical construction. Steel City� switch and outlet boxes are protected from rust and corrosion by zinc-galvanizing. All clamps and other component parts are electrogalvanized separately, before assembly in the box, to ensure corrosion protection of every surface. Steel City� galvanized finish meets the requirements of Underwriters Laboratories, Inc. and Federal Specifications."