I must have surprisingly hard wall tiles. I bought two of these and each wore out after drilling an average of 1.5-2 holes. Now I have one bit that has clearly lost its sharpness and another that seems to have lost its head. However they worked where my previous Bosch masonry bits which came with an assortment of different bits (also made in China) failed. May I recommend you? Despite the short lifespan, I have to say yes, because I just bought 5 packs exactly the same. Look for 5 packs in Revain.