I bought one of these to help me make perfect wings and they came out great. It is just a stainless steel ring that is welded together and measures 8"on the top and 12" on the bottom. You center it under the cooking grate and when coals are hot you line the wings around the perimeter of the grill . In 1 hour the wings were done and skin was very crispy. I used it on my Weber 22" kettle.