surprisingly good ... 4

despite the very low price (Profibohrkronen cost many times) was the bit surprisingly stable .... more water drain holes in a 15cm thick, very tough concrete slab (without reinforcement) no problem and in half an hour were done in conjunction with my Hilti hammer drill. ..The Betonbohrservice had 380, - Euro taken. Meanwhile, I have with the crown already often holes in wood panels (should be done with a little less speed, otherwise the torches from) drilled (for sockets), tile and masonry no problem. For the price and "opportunity drill" the hit.