The quality of the bits is in my view in order (with me only DIY craftsman not stress). The compilation is practical and clear. Marking in the box as well as the bits themselves. The coupling piece to the machine has some runout, which I do not really disturbing feel in my case, there is by playing games on the bit and the screw towards adequate compensation. Since this has been criticized in some recessions, there could be fluctuations series of course. But machine tool precision can not be expected at the price simply. Less Like the hakelige opening the box. One has a tab on the lid to bend to open it. A hakelige, finger unfriendly affair. Here I would have liked a more subtle solution. Advise against the purchase I would therefore not.