It's how I roll!
I have a couple different sizes that get used in my 22" WSM's and Cajun Bandit.
This one is the same size as an 18" WSM ring, have another made out of expando. Use them for Hot & Fast cooks
This is one I made for one of the Mini Smoker Joe's - expando on an SJS charcoal grate, used it many time in the 22's