52 Steel City® Standard square box is perfect for use with conduit. It features welded steel construction with pre-galvanized finish. It has two 3/4-Inch knockouts at each side, two 3/4-Inch knockouts at each end and three 1/2-Inch knockouts at bottom. This CV bracket mountable box measures 4-Inch x 4-Inch Height. It has capacity of 21-Cubic-Inch. Square box is UL listed.