Attributes . Corrosion-resistant ideal for indoor and outdoor installations; Weatherproof, raintight and dust-tight when used with cast gasketed covers; Malleable iron for high tensile strength and ductility provides greater resistance to impact and shock; Both malleable iron and aluminum boxes have ridge top construction for positive cover/gasket/box fit; Accurately tapped, tapered threads for tight, rigid joints, ground continuity; Internal grounding screws standard; Accommodate wiring devices such as switches and re . Names