The way I use the pair of Weber baskets is pretty flexible. With the curved side you can put one in on one side, both in across from each othe (leaving middle open for drip tray or indirect heat) or when I use the center sear grate, push both baskets together, in the center, and the screaming hot center leaves the outside rim of 6 inch or so border as your indirect/safe/warm zone. The two half/moon shapes go together and line up great with the size of the sear grate. Those baskets work great for creating different cooking zones. Best bang for your buck of an accessory for the kettle, in my opinion. Gives you simple set-up & control of a lot of different methods.