Hubbell 6-gang large capacity recessed concrete floor box. Made of stamped steel. Fully adjustable. 3-1/2-inches minimum depth of pour. Concrete cover and cover mounting brackets included. UL listed, File Number E31999 and CSA certified, File Number LR18416. (1) Concentric 1-inch, 1-1/4-inches and (1) 3/4-inches knockouts – per chamber. (4) at 38.2 cubic-inches, (2) at 25.4 cubic-inches capacity per chamber. Measures 12-59/64-inches length by 12-59/64-inches width by 6-3/16-inches height.