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without knowing the size of that one it looks exactly like the one I tried to use (it was bought a few months ago for another job, and was sold as a radiator key), but was just too small, it started to catch the fitting but when I put any pressure on it, it just slipped inside the fitting. The...

I was trying to change a burst radiator for a friend, but found I did not have the correct size of allen key to remove one of the radiator tails. the biggest I have is 12mm, which was just too small. Can anyone tell me if the standard size for these is 13mm or is it 1/2"?