Cast iron trivetExtends the Petromax range Great open air cooking experience Keeps the food in the pot Can be used for direct grilling or smoking Safely stackable with the small stacking grid gr s The insert made of solid cast iron creates first class heat distribution just right for baking in the fire pot. Because the insert stands on three knobs, you can steam, cook and bake with the cast iron grate insert in the fire pots ft4. 5, ft6, ft9 and ft12 without burning.