"I had low expectation for the item due to poor reviews - yet I think they are overly harsh. It's clearly a cheap and cheerful item but it happily drilled 4 holes through 10mm porcelain floor tiles from Topps.
Drilling through porcelain is always going to be tough on drill bits but if you are just doing one project this will probably do the job."
"cheap but unfortunately not up to the job. This bit was used to wet cut a hole in a floor tile, it made a good clean hole but was left with no cutting edge to do a second hole. OK for a single hole cut."