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30 does sound right. It's been three years since I bought the socket and I haven't looked at it since. Apparently my memory isn't as good as I'd hoped.
It is 30mm. Make sure if you buy a socket you look inside of it to make sure that the socket walls remain constant all the way to the back of it. The first one i bought had a big ridge in it about 1/2 way in and was useless for the injectors, as they hit that ridge well before the socket was engauged.