4Grillersjoy Cast Iron Grate, Pre Seasoned, Modular, Fits 18.5" Grills and Large Big Green Eggs Cast Iron gives off a more even heat and holds it far longer than steel - great for amazing grill marks/sears Seasoned Cast Iron Grates provide a non stick cooking surface - brush the grate clean in seconds Strong & resilient - Cast Iron Grates withstand higher temperatures than normal grates. And like other good Cast Iron product it will last a lifetime if cared for properly Modular - Add griddle, hotstone and chickenseat for ultimate versatility. Steaks, Wings, Pizza and a whole grilled chicken at the same time Fits 18-1/2-inch charcoal kettle grills and large Big Green Eggs, actual diameter 17-1/2-inch