it works on everything I have put against it
i also bought the water cooler kit which is garden sprayer for £30

i found both the drill and hole saws work very quickly when used with the water cooling kit, they do slow down as they blunt
faults,
well the holesaws have a fault in that the diamond coating creates a ridge inside the hole saw and wont cut through a thick tile, but if you drill it from both sides it works
and I broke two tile drills having to drill down a grout joint, but thats my fault really
and the bits are very expensive