The Middle Grill sits in the middle of the Volcano Collapsible Grill. It acts like an oven rack so that  you can bake bread, rolls, and cakes. Place your pan on the middle grill, cover with the Lid and you have an oven. You can also use the middle grill to grill on two levels with charcoal. Use the Middle Grill for charcoal to move the heat closer to the top grill.  The middle grill is 12.125 inches in diameter.