> > metric crescent wrench
> > rubber nails
> > spotted paint
> > (all of which actually exist)
> I just gotta ask, then, what's metric about a metric crescent wrench?
> Maximum jaw gape? Overall length?
length. Crescent wrenches (both generic and (R)) are normally
identified by length. 6" and 8" crescent wrenches are commonplace;
150mmm and 200mm ones are less common.
And what on Earth would one do with rubber nails?
nail up rubber weatherstripping
("rubber" is referring to their use, not their composition)