This floor box is furnished with a Solid Brass cover & 15A Receptacle, and a Very heavy duty cast iron box. (Size: 14.5 cu. in. interior).  Flush mount.  Dimensions are 4" top and 3-18" bottom section with 6 conduit openings. Two-3/4" and two 1/2" openings on the sides, two 1/2" openings on the bottom.   Additional covers that work with these boxes are the AP-TCP Series at 5-3/4 inch round in brass and aluminum, or our AP-PFC series heavy plastic covers. Also the AP-812-MKM double hole saw is a convenient method for cutting the wood floor, as it's almost mistake proof!