The Premo Company Inc.
Pans / Rings / Cans
The Premo Company Inc. Home Page
Pans, Rings, and Cans are used for many different applications.
The Premo Company Inc. has a wide selection available from 1" up to 42" with many variations in size and depth.
The above photo has an example of a few cans that  have been baffled with flanges, and or beaded.