Both the 16 inch and 20 rims are formed from 11/32 steel plate. The General Motors rims look to be stamped/forged as they have crimp marks around the rim flange similar to die marks (on both 16 and 20 inch rim sizes). Kelsey rims don't have these marks, and while they may also have been stamped or forged to form the rim, they appear to have been finished by rolling or spinning.
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