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what, what, what.......... Americans have no clue what you just said. The most confusing time in the US was when our government tried to go metric(it's a great theroy, just could not get the "dumb masses" to change)
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When I buy new tools, wrenches sockets etc, the imperial sizes go in the tool box that goes with the Vermeer chipper and all the metric sizes go with the toolbox for my UK built chipper.
It works well for me!