In order to renovate my bathroom, we had to cut some holes in the porcelain stoneware for the shower taps. It worked as long as I squirted water onto the tiles from a water bottle while my dad drilled. Can't say it will last much longer than some tiles, but the porcelain was pretty tough and did what we needed. If you're someone who needs it for multiple jobs I'd probably keep looking, but if you're doing a single bathroom it's worth it. BTW if I had to do it again I could just use the smaller one I had and use it to drill a larger hole a few times as the smaller one also fits the drill bit we bought here.