I had the bit set is not very often in use, so I can not (yet) report of broken bits. In the used traces are present, but is still in the green zone. Nevertheless I have somewhat qualtativ imagined better. What I do not understand: some bits and the bit holder have after about three months to rust Sellen, even though they are stored dry or another tool, which is also located in my Grarage, does not rust after years. Therefore 2 star deducted!