The Lew Electric SH-6263-58 is an Aluminium concrete floor box with a three gang brass top. The box offers 1" of adjustability before it is installed, the box cannot be adjusted after installation. The box is shallow making it perfect for concrete installations of 2.5" to 3" in depth. There are eight 3/4" knockouts on the box to run your wires to. The box ships with a protective cement cap 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.