These drills are excellent. It's too early to know about their durability, but they're well marked, true to life, and beautifully cut into a variety of materials. However, this is not the case. A couple of the tabs holding the bits were broken on arrival (the box they came in and the plastic case were intact) and a couple more broke on first use. The end result is that the bits will not stay in place when the case is closed and transported. I don't care since the case is mostly in my toolbox drawer, but it might be important to you. Again very happy with the look and function of the drills themselves but the plastic case is seriously lacking.