I am a retired mechanic. I spent 10 years restoring classic muscle cars and building hot rods. I bought these nuts for my personal car and am very disappointed with the durability, or should I say the lack of it. I installed them with hand tools and did NOT use a percussion gun. Every one of them was cut and scratched! Keep in mind that I'm a retired professional not bragging, just wanting to make it clear that I know what I'm doing (I don't use a baton). I couldn't be more disappointed with this product and would not recommend buying it. π‘