Will these work on my wheels if I'm switching from steel lug nuts?

These are M12 x 1.25 — they'll fit any vehicle that uses that thread pattern. Verify your vehicle's spec before ordering, as some vehicles use M14 or other sizes. If you're unsure, check your owner's manual or existing lug nuts.

Do I need to apply any sealant or anti-seize when installing these?

Not required, but anti-seize compound on the threads makes removal easier down the road, especially in corrosive environments. Standard practice for any lug nut swap — optional depending on your climate and how long you plan to keep them on.

Can I use all 20 nuts if my vehicle has more than 20 wheels?

This set gives you four complete wheels' worth (5 nuts per wheel). If your vehicle runs more than four wheels or you need spares, order multiple sets.