>>The shape of the Weber kettle, makes it work beautifully. It won't work if your kettle is smaller than the 18 inch one. Mine is 22, and it works very nicely.
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>I think mine is 22 also.
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>So what you are saying is that it is kind of conical shaped thing you put in there, and it forces the charcoal to the outside and you cook the food in the middle? I might look into it.

No they're wire type things. Here look at this.