If it's branded 'Milwaukee', I run away quick. 'Milwaukee' stuff is over priced generally.
I like the Milwaukee pack-out system for sailing gear, all the organized bins to sort pins, shackles, ring dings, bobbles, and the big bins for lines, foul weather gear, etc. Great to be able to wheel it off the truck and right down to the dock. Also, relatively weather-proof, so all your gear stays dry, even in nasty coastal salt-water environments.
But I wouldn't even think of using that plastic crap as an actual
tool box around tractors and equipment! Like Hay Dude, I think I'd break it in less than a week, and that comes from someone who actually owns a bunch of them.
Yeah, they've got an insane mark-up on that crap, they'd probably make a killing selling it at half of market price. But for a very portable and stackable system that keeps gear dry in the bed of a pickup sitting by the boat ramp in salt spray and rain, it works better than other things I've tried.
As to the OP, I'd just buy an SAE set up to 1-1/8" and a metric set up to 30mm, or whatever you find at decent price. Sizes above this are usually bought one at a time, as they're all special purpose, and very few weekend mechanics need
every size above 1-1/8" or 30mm.