How do the locking nuts work?

The four lock nuts have a different thread pattern or cam design that requires a special key to remove — that key stays with you. The standard lugs screw on normally; only the locks need the key. This prevents someone from quickly stealing your wheels.

Will these fit my vehicle?

M12 x 1.5 is a common fitment for many cars and trucks, but you'll need to verify your original lug nut size before ordering. Check your owner's manual or remove a wheel to confirm the thread pitch.

Do I need to replace all my stock lug nuts or can I mix these in?

You can mix them — install the four locks on the most visible wheel positions and use the standard aluminum nuts for the rest. Some builders prefer all matching for appearance, but functionally they work together fine as long as torque specs are followed.