74 ScrubShield® 2-Gang Deep fully adjustable concrete floor box is suitable for concrete floors. Flush floor box features cast iron construction and has brass collar. Rectangular floor box measures 4.38-Inch x 6.38-Inch x 3.75-Inch. It has 36.5-Cubic-Inch capacity. This floor box has four 1-Inch and two 3/4-Inch knockouts. It comes with concrete cover and closure plugs. Floor box is UL listed and CSA certified.