This classic floor grate is made of 2 separate parts, an outer square and an inner circle. They are cast iron and measure approximately 31.5 square. I bought it to become an outside shower floor, but never got around to building my shower. I've seen these made into awesome tables, fire pits, etc. So industrial and steampunk - from the 1890's!Take my salvage and make it your unique piece. The item "Architectural Antique 31 Sq Cast Iron HeatVent Duct Floor Furnace Grate Register" is in sale since Saturday, March 26, 2016. This item is in the category "Antiques\Architectural & Garden\Hardware\Heating Grates & Vents". The seller is "iching2buy" and is located in Austin, Texas. This item can't be shipped, the buyer must pick up the item.