I couldn't help reminiscing on this topic. I can remember back when I was just a young tater tot in the early 1970's, the sense of sudden urgency instilled by our slightly hippie math teacher that "the metric system is coming... the metric system is coming... get ready... learn it now or you'll be left behind"
Seems that after a couple of months or so, the fury just sort of died down.
Now here it is, close to 40-years later and we still have to buy both individual Metric and SAE tool sets or combination sets of every type open end, box, combination wrench, socket, hex head wrench, tap and die ever known to man.
I think it's relatively safe to assume that by now we've all pretty much become accustomed to it and it just seems natural, almost expected to see many types of equipment using both Metric and SAE fasteners.
In retrospect, it could probably be seen as a brilliant marketing strategy by the tool and die manufactures.
