Cast Iron Grill Pans FireIron™ - WincoThe Square and Round Cast Iron Grill Pans by Winco are high quality grilling pans designed for indoor and outdoor cooking. These pans are part of the FireIron collection, which means they are made of cast iron and designed to handle high heat. The grill pans are available in both square and round shapes, with the square pan measuring 10" x 10" and the round pan measuring 10" in diameter. They have deep ridges that mimic the grates of an outdoor grill,