Steel City 54151-1/2 4" Octagon Box, 1-1/2" Deep, 1/2" KOs, Drawn, Steel Octagon Box, 15.8 Cubic Inches, 4 Inch Diameter x 1-1/2 Inches Deep, 1/2 Inch Knockouts, Pre-Galvanized Steel, Drawn Construction, For use with Conduit Also known as: 785991169003, STL5415112, Steel City, 54151-1/2, Octagon Boxes, Octagon Boxes & Accessories, Boxes - Metallic, Boxes, Enclosures