Excellent reproduction made from strong nodular iron which is over 2 times stronger than cast iron less hub and hub bolts for 1928-31 cars. Inside diameter of a new drum is 11 inches. If your drums measure 11.070 inches inside diameter or .110 of an inch thick, then they are worn out and should be replaced. Original steel drum wall thickness is .145in. These drums are acceptable per judging standards.
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