Grill Valueparts REV9CIG Cast Iron Charcoal Fire Grate for Large and Minimax Big Green Egg Grill. Dia. 9 Inches Cast Iron Charcoal Fire Grate for Large and Minimax Big Green Egg Grill, 9 inches. Material: Cast iron Heavy duty cast iron Construction and long lasting. Retains heat and delivers professional searing, prevents sticking and allows for easy clean up. Fastest and easiest way to reach and maintain high or low grill temperature.