SOME PEOPLE DON'T KNOW WHAT THEY'RE TALKING ABOUT!
I have sold many sets of what I referred to as GNX lugnuts with caps. They are the same as the one's you've (Audio Wizard) pictured in you're post. I sold a set to a guy and he complained they didn't hold on the center cap. I never used them in that application so thought what he said was accurate. Obviously, he was confused. Thanks for the clarification.