Well I thought this would be the answer to get through what appeared to be really hard tiles............ noever had problems in the past just using ordinary TCT drills but they wouldn't touch them. Tried this bit on a different tile, using a pillar drill.......... went through beautifully. Tried these hard tiles and would only scratch the surface............. don't know what they were made of!! Ended up using thew old TCT drill bits on a hammer setting....... cracked the tile but eventually got through.
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