When we bought our '05 Corvette three years ago, it already had the anti theft lug nuts, one per wheel. I have the original painted wheels and tires that I use for winter storage and the chromed set for summer. Today, while installing the summer wheels, the side completely broke out of one nut. Figuring that I must have put side load on it, I was very careful on the next one. A little piece broke out of it but was able to get it off. The other two came off without incident. I guess I will have to put my 41 years worth of tool and die skills to work and go at it with a die grinder.....unless someone else has a better idea or tool. The nut, judging from the break, appears to be glass hard as in above 62 Rockwell.