As an update to this thread...
I see that the Rotozip bit XB-FT1 and XB-FTC1 are supposed to cut granite and porcelain tile.
Wonder if anyone has tried it?
Reason I'm wondering is because I messed up and have to figure out a way to trim 1/4" or so off some porcelain that I've already laid down, because it's the edge for a trim / threshold piece. Only a few of the tiles are out (yes I know, measure twice and all, but changed my threshold plan after the tile went down).
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Paul DIY