Do the lock nuts come with keys?

Yes. Each set of four lock nuts includes unique keys so you can remove your wheels if needed. Keep the keys somewhere safe—losing them means you'll need extraction tools.

Will these work with my existing wheel studs?

These are M12x1.5 threads. As long as your vehicle uses M12x1.5 studs, they'll thread on cleanly. The 50mm acorn height is a common fit for most modern wheels, but verify your stud size before ordering.

Can I just bolt these on, or do I need to torque them to a specific value?

Hand-tighten first, then refer to your vehicle's service manual for the correct torque spec. Over-tightening aluminum nuts can crack them, and under-tightening risks wheel wobble or loss during driving.