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stevo_com-
These. And they self-centre, pretty much, if you're making bigger holes.
I've only ever used the diamond ones on glass tiles - Even with my heavy-handedness, I've not managed to crack ceramic tiles with the triangley bits.
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Cheers, that type looks like it will do the job. I don't have an 8mm diamond core so would have needed another bit anyway.
NotThamesWater
aggi
I drilled some 6mm holes in my bathroom tiles to put up a cabinet but I'm now having second thoughts about the fixings and have decided the holes need to be 8mm.
What's the best way to open them out without cracking? I used a diamond core bit which doesn't have any centre to locate in the existing hole so I imagine doing that neatly with an 8mm bit would be a bit of a sod.