Agreed. I have something similar to this:
View attachment 371183
The one I have is 38" in diameter and has several spiral flutes on the inside (used for adjustable width, I believe). It's old, rusted beyond it's purpose in life, and absolutely perfect for a fire pit.
A few more minutes worth of searching yields the proper name for my pit ring... a "spinout" wheel, like this:
View attachment 371192