Thank god for them. I have a 2006 Chrysler 300 and I swear every time I get them to flip the tires we have a problem with our nuts getting swollen(?). I have no idea what the exact details of that are, but they said something about the lid bulging, making it impossible to remove without ruining it. Every time I do regular tire maintenance, I'm paying $13 for a Chrysler nut, and seriously, I'm way too cheap for this crap. Bought and so far they have worked like a charm. I wish they came in packs