Imperial or Metric?
Discussion
One of the good things to come out of Europe IMHO.
Is the metric (ISO) thread system. Primarily two threads (fine and coarse) with a 60 degree thread form. Usually in 1.0mm size steps.
Now the old English system was / is (still for the classic car guy's) a bl**dy nightmare, about 20 different thread forms, about 6 difference types of spanners required to fit them all.
Metric ISO system. OH 
Is the metric (ISO) thread system. Primarily two threads (fine and coarse) with a 60 degree thread form. Usually in 1.0mm size steps.
Now the old English system was / is (still for the classic car guy's) a bl**dy nightmare, about 20 different thread forms, about 6 difference types of spanners required to fit them all.
Metric ISO system. OH 
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