I just sent the following email to McGard:
I just had 2 of your 'premium' wheel locks break. The outside edge of the lock portion sheared off halfway around the head of the bolt. They are Part @ 27181, size M14x1.5, key code X-##### #####. So now I can't get 2 of my wheels off my car. 1 I might have been ok with. 2 is VERY unacceptable. Needless to say, I'm a bit perturbed, and on my way to a tire shop to see if they can remove them.
I was trying to rotate my tires & they sheared. Grrr.