CF9C4B is a floor box designed specifically for concrete pour applications. Included is a heavy duty cast aluminum black lid, when closed there are 5 gaps for cables to pass through while they are still connected inside the box. Inside the box you will find openings for 4 decora cutouts. The box is made of a very durable 16 gauge galvanized steel, and the lid features a heavy duty 1/4" thick flange and a 3/4" thick bottom lip. The lid features a 1/4" recess in the top for inserting carpet or tile. There are two knockouts on each side of the box, they can be popped out to accept either 1/2" or 3/4" conduit. The minimum concrete pour depth is box height (4 1/8") plus 1/16", there are 4 leveling feet to ensure the box is level before pouring. Also included is a temporary cover for the box to be used while pouring concrete. The Lew Electric CF9C4B is an affordable high quality concrete floor box that allows cables to be plugged in with the lid closed.