4 in square, 1/2 in raised, two duplex receptacle industrial surface covers are used to attach a two duplex receptacle device directly onto 4 in square boxes in a industrial setting. Garvin Industries 4 in square industrial surface covers allow for a quick installation of duplex devices to steel covers before they are mounted to the box. GARVIN® Cover, 4 in Length, 4 in Width, Square Shape, (2) Duplex Receptacles Cover, Surface Mounting, Steel, G60 Galvanized