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A socket where there is a thread inside that turns the opposite way. So as you turn anti-clockwise to undo a nut, it grips down on it. Useful for nuts and bolts that are rounded off.

Just an update: As I explained earlier Mercedes wanted upwards of £80 for half an hours work just to remove three McGard wheel lock bolts ( that they had the key for anyway! and weren't even going to try to extract the damaged bolt ). So I explained to them that £80 is really is too much just to...

Brilliant! I'll do this on my day off on Thursday. Thanks so much.

Would you drill and the bang on a torx or just straight off try and bang in?

They are in tight, but nothing a breaker bar won't turn quite easily. So bang in a torx? Might give that a go, cheers!

Cheers for all your help, looks like I might need to find someone to drill it out. Cheers

No just the grips of the lock key broke into the grooves the collar will still spin.

Cheers, there's 5 bolts but no the wheel won't rotate around the bolt. But i wondered if I jacked up the car and took out the other lugs, that I might be able to pul the wheel enough to loosen the bolt a bit and might have a better chance at turning it?

Thanks I did read that yesterday. But they come to the conclusion for a Mcgard lock you need to drill it out.

I was thinking of trying this but I can't get a socket far enough into the gap to grip the nut. It needs to be thin and at least double the length.

Unfortunately I can't. Yes the collar spins. I was wondering how easy it would be to get the collar off? Will it break off if I bang a smaller socket over it? Also getting a socket that's thin enough and long enough is also a problem.

I've got a 2006 C class Mercedes, when removing a wheel to check the brake pads, the wheel locking nut broke and sheared the lock nut head into the locking nut. Now I have a useless wheel nut key and 3 lock nuts that are ok and one that you can't remove even if I got another key. Mercedes are...