This 4-inch square steel conduit box offers a shallow 1-1/2 inch depth, providing a durable and corrosion-resistant enclosure for multiple wire connections and device installations. Designed for versatility, it features concentric knockouts accommodating various conduit sizes and a raised ground screw for enhanced safety. Suitable for both residential and commercial applications, this box is built for strength and longevity.The BOX 52151-K is a 4-inch square steel conduit box with a 1-1/2 inch depth and a cubic capacity of 21 cu. in. It is constructed from galvanized steel and features concentric knockouts for flexible conduit installation. The box is CSA Certified and suitable for wall or ceiling mounting.