Hubbell Wiring Device-Kellems SystemOne ScrubShield Poke-Through Assembled Unit, 1-Piece Recessed Standard Sized, 4 in Hole, 1/2 in, 3/4 in, 1 in Knockout, 23.5 cu-in Capacity, Fire-Rated Device, For Use With: Concrete Floor, Die-Cast Aluminum Cover, Assorted Materials, Brushed Brass