CYLBAQ Diamond Hole Saw Drill Bit, 10pcs 6-38MM Hole Saw Cutters, Slate Porcelain Marble Hollow Core Drill Bits Tools Set for Glass, Ceramic, Porcelain, Tile, Marble, Granite

They are ok for the moneyBest buy what yoy need for the job and then bin after as they are good for about 4 rough holes. Please dont but if your looking for precision. They skip all over the place

Nice little set which will be just the job for my husband to cut through new tiling to replace toilet bowl following repairs.

Not that good they slip if you don’t hold them tight

the drill bits were very good at a very good price. had others from other firm which bluntened and broke drilling one hole, these stayed sharp after drilling holes into ceramic floor tiles

Used them to drill through porcelain tiles did the job quite well for the price

Seems a good enough product for the money.

Absolute waste of time and money.

As bits go they do a decent job, I drilled into brick to make holes for a key safe I was fitting to the wall, without too much trouble. Having only used one of them so far I can only assume all are up to the same standard. I like that there are a great range of sizes, right up to 38mm, sufficient for feeding pipes through walls for example.The larger ones all come with their own little boxes, the smaller in plastic bags. I think it would be good if some form of case or box were included.The real issue with these, however, is that the drilling end is basically completely flat, so there is nothing to hold them in position when you start drilling. The bit end can jump around uncontrollably until it starts biting into the brick. I would be very wary of using one directly onto a porcelain tile, as I can't see any way it would not scratch the surface badly if it were to slip. Realistically these need a pilot hole drilling first to have any chance of a good finish.I thought that the price at £20 was reasonable, but they could do with a redesign or perhaps a pilot bit included.