||For installing flush floor boxes, look no further than Arlington's Flush to Floor Box Kits. Can be installed in an existing wood or concrete floor. Measuring 3.5" round, our UL listed non-metallic floor box offers a convenient way to install a duplex receptacle flush with the floor. This kit comes with non-metallic box, 4" round metal cover, non-metallic gasket support plate, gasket, UL listed 15A tamper resistant duplex receptacle, NM94 and NM95 cable connectors, (3) #8 x 1/2" flat head screws, and (1) #6 x 1/2" screw. Box has a volume of 15.0 cubic inches. Metal cover is brass with two flip lids.