Do these need prep work before installation?

The black anodized finish is ready to install as-is. If your wheels have old corrosion or debris, clean the lug seat on the wheel before threading these on to ensure solid seating.

Will one set cover all four wheels?

Twenty lug nuts is enough for five wheels at four lug nuts per wheel. If you have a five-lug setup, you'll need two sets for a complete vehicle or one set for a spare wheel.

What if these don't tighten down flush?

Open-end design means fitment depends on your specific wheel and hub. Test-fit one lug nut before committing the full set. If seating is inconsistent, your wheel taper or hub may require a different lug style—reach out with your wheel specs.