4 in. Square Box, Welded with STAB-IT® Connector, 2-1/8 in. Deep, 600V, Raised Ground, 8 in. #12 Solid Copper Pigtail. Welded steel construction. 4 in. square x 2-1/8 in. deep. Designed for quick installation of flex, MC, MCI, MCI-A, AC, and HCF Cable. TKO® Knockouts allow for design and installation flexibility. Supplied with seven 1/2 in. and four 1/2-3/4 in. TKO® knockouts.