The heavy cast iron Primo Firebox Divider allows you to split the fire box area to create two distinct cooking zones for simultaneous direct and indirect cooking. It allows you greater cooking flexibility to create the perfect doneness of food, and the indirect side roasts tender foods like seafood and vegetables to infuse the wood fire flavor without charring. It also conserves the amount of natural lump charcoal needed when only half of the grill’s cooking area is needed. Place the Firebox Divider in the slotted areas of the charcoal grate to stand it vertically in the grill. One per box.