Will these fit my wheel studs?

These are M12x1.5 threads — measure your stud diameter and pitch to confirm before ordering. If you're unsure, check your vehicle's owner manual or contact a local shop to verify thread size.

Do I need to replace all 20 at once?

You get five sets of four in this pack, so it covers most four and five-lug vehicles with spares. If you run a single vehicle, you'll use four or five per wheel depending on lug count; the rest stay in your toolbox.

Can I use the key wrench to torque these down?

The key wrench is for removal and hand-tightening only. Use a calibrated torque wrench for final tightening — refer to your vehicle's service manual for the correct spec, typically between 80–120 ft-lbs for most applications.