Maybe I don't know what the hell I'm doing, but in my past, I've never had any success drilling through porclean tiles no matter what type of bits I used, and I tried several....years ago. Floor tiles though....I don't even try anymore....I just plan tile layouts, etc. ahead of time and use my tile wetsaw to make appropriate cuts....YMMV. I wouldn't even try....use an adhesive imo....
Trekkor will know....
