How do you sort your tools

Yes, but the nice about Metric is this.

10 mm too big, but 8 mm to small. Well, duh. It's obviously a 9 mm.

I don't have to do any damn fractions in my head to figure what size I need. I can do the fractions, but at least with Metric I don't have to.

Just saying!

This theory only works on "stuff" that you KNOW is 100% U.S. or metric. There were a few years in the 70's--80's and maybe even "now" where cars were mixed U.S. and metric. I guess? The magnum engine series was that way?

The other "*****" about metric is standardization of useful sizes. Use to be when you bought a metric "set" there were certain sizes missing that were hardly used. GM for ex I think used to like 15mm, and you NEVER used to find them on Japanese bikes.

And..........it even gets worse

In a previous life in the early eighties I was working in parts. a GM line mechanic came in, he "had been" down to our fastener's store, I was in main parts. he had a bolt "and he knew" it was metric because it was a 10mm head. He could not find the right "pitch" threads

It was a 1/4" U.S. bolt thread with a 10 mm head!!!!!