I purchased these and whilst I am impressed with the quality and appearance of the lock nuts themselves I was very disappointed in the quality of the wrench. It has thin brittle metal and broke when I tightened the last wheel. All I can say is I'm glad this was the last bike and not the first. Anyway, hopefully I won't have to take them off anytime soon because I don't have a function key. The key should definitely work after the first try, so I'm very disappointed. I didn't even tighten the screws. It would be nice if the metal of the key wasn't paper thin.