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.