Gasketed Weatherproof Back Box Color Gray Width 4.5313 in Depth 2.4375 in Height 4.5313 in Material Cast Aluminum w/Neoprene Gasket For Use With 4 in and 6 in Vibrating Bells and Horns Features Mounting Lugs and Threaded Conduit Openings 1/2 in and 3/4 in w/2 in Deep Mounting Lugs on 4-1/2 in Centers Includes Cast Aluminum Gasketed Mounting Lugs and Threaded Conduit Openings 1/2 in and 3/4 in (does not include screws/hardware)