Box, Octagon, Drawn Construction, 4 Inch Diameter, 1 1/2 Inch Depth, 15.8 Cubic Inch Capacity, 1 1/2 Inch Conduit Bottom, 2 1/2 Inch Conduit Sides Knockout Size, 4 Cable Ends Knockout, Hot Rolled ASTM G 60 U, AISI C 1008 0.062 Inch Steel Material, Galvanized Finish, For Use With Non Metallic Sheathed Cable, C 5 Type Non Metallic Cable Clamp, UL 514 A Approval, Federal Specification W J 800 Applicable Standard.