I bought 30 although I only needed 20 in case I broke installing one or more failed were . But I've never needed them that much. They arrived on time and were all in good condition with no damage. I bought these to replace weak cleats and they are much better. I bought a stud installer because I replaced all 20 on the car and it was worth it. All 20 fit perfectly and are snug. They held up 100% when installed and fit easily into the new wheel nuts.