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The American Auto industry has been metric for nearly two decades. A few old pieces of hardware may have squeaked through due to lack of redesign. American military standards seemed to set the rules for socket drives during the cold war. Prior to that, some drive sizes were different, 9/32 drive instead of 3/8 and one other but the specific escapes me. It's not hard to use both and niether is should be confusing for someone appliing them regularly.
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