Do these work as a direct swap for my factory lug nuts?

Yes — M12 x 1.25 is a common thread pitch. Verify your vehicle's specs match before install to confirm fitment.

Which 4 nuts are the locks?

The 4 lock nuts are among the 16 pieces included. They feature the locking mechanism to prevent wheel slip. You'll use one lock nut per wheel, typically positioned opposite to the valve stem for visibility.

Do I need a special key to remove the locks?

Lock nuts of this style typically require a matching key (sold separately on most applications). Confirm availability of the key before purchase if you don't already own one.