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I'm looking at my new USA made 1/2" drive deep impact set, and I notice the broaching on the 7/16" and 3/8" looks the same. I got a 3/8" allen socket and tried it in both and they are the same, the 7/16" is broached 3/8" It doesn't seem to be a 3/8" socket roll marked wrong due to the way the...