UNILETS® Cast device box made of malleable iron. Thick wall on all four sides. Drill and tap anywhere on sidewalls. Ground screw at top of box for easy access. Two exterior mounting lugs. Fits standard sheet metal device covers with four mounting holes. Weatherproof when used with gasketed cast weatherproof device covers. Malleable iron is triple coated with zinc electroplate, chromate and aluminium polymer enamel.