Floor Box Covers in Nickel Silver for Concrete Floors 4'' Cover (1/8'' Thick) with (2) 1-1/2'' Screw Plugs for Duplex.  These are designed to work with the AP-812 Series Floor Boxes for wood or concrete.   Flush mount.   Also suggested is the AP-812-MKM double hole saw for accurate cutting of your wood floor when cutting the hole in the wood floor for our AP-812 series boxes.