"drilled 3 holes in hard Porcelain tiles still looks ok for further use. takes a while (but they all do) - i used semi wet. I tried no name cheaper ones before but they struggled to do one hole before they wore smooth."
Share this Review:
Review 3 for Erbauer Diamond Tile Drill Bit 30 x 8mm
"Drilling porcelain tiles which the screwfix titan cutter cuts easily, it went blunt after 1.5 holes. The no-name equivalent (which you use wet, not dry) finished the job easily. Go for the no-name for 4.99- this isn't useful for porcelain at least- might be ok on softer stuff."