You'll need a lug wrench or breaker bar to loosen the nuts and a torque wrench to tighten them.

Until you're stuck because your lugs nuts are swollen and can't be removed to change a flat tire, wheel studs and lug nuts are often ignored.

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Similarly, a lug wrench (also called a cross wrench) can be used to manually remove lug nuts with the same downsides of the breaker bar.

I’ve found that breaker bars help for loosening especially tight wheel bolts, suspension attachments, and subframe bolts. There are places on a car where an impact gun simply won’t fit.

These lug nuts are indeed made of two different metals. There's the lug nut itself, which is steel, and then there's a thin, chrome-plated metal covering, which is entirely cosmetic.