Agroshield
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I did indeed capitalise the h apologies for any confusion
I do not know why ISO has done such a thing with the tolerances. It is so, so easy to make a typo. and if a person were writing something that had to go through an editorial process, even if the first person writes it correctly, it might not be correct at the end. To me, it makes more sense to have a chalk and cheese distinction between the two.
This document is interesting on reamers (from the Internet Archive, becasue T&J do not seem to exist any more).