In rock climbing you'll find that protective gear follows a similar system.[1] Though of course different manufacturers choose different color schemes mostly. Being able to quickly grab the right size piece that fits the crack you're placing into is exceedingly important.
If you get the right kind of paint/marker you can mark the bolts with the same color as the wrench, then you can see what wrench you need from many feet away.
[1] https://www.summitpost.org/size-matters-a-gear-comparison/69...