The Lew Electric 1102-58 is a cast iron concrete floor box with a dual gang brass top. The box is fully adjustable and offers 3/8" of adjustability after it is installed via 4 screws with just a screwdriver. The box is deep offering 3.32" of height for installation, and 13 cubic inches of interior space in each gang. There are a total of six 3/4" knockouts in the box to run your wires to. The box ships with a protective cement cover to keep the box clean and safe during concrete pouring. The box does not ship with a cover, there are several options available that are sold separately. If the box is to be used in a carpeted area a sold separately carpet flange can be ordered, the CF-1100 series carpet flange adds 3/8" of height to accommodate the carpet and padding. For tile applications no flange is needed, simply pour your concrete to the level of the tile frame less the thickness of the tile. To further make installation as easy as possible, screws are provided to mount the cover assembly to the box. The box is UL listed for the USA, and cUL listed for Canada installations.