Drills on concrete - disposable for concrete. Only suitable for brick and drywall. Drills for metal - only for soft metals. Like black or aluminum. Steel 1mm with great difficulty managed to drill. And that was enough for a couple of 5mm holes. The tip is all stepped and partially chipped. Zenker in general seems to be intended only for wood. The fact that this is Bosch is captivating. But in fact it is a branded disposable set. Which can be given as a maximum and put on a shelf. Maybe, of course, I’m a hand (master-master), but at work with drills, I don’t have such problems, not that I don’t. They didn't exist. This set is sparta level. Even though she was better behaved
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