I buy this model for the second time, for a year of use I discovered one serious drawback, if you store the set in an important room, then the bits will definitely begin to corrode. If you are going to store the set in damp rooms, I advise you to buy model 2.607.017.459, it is less susceptible to corrosion. The second time I buy it as a gift, knowing that they will store it in a dry room. Model 2.607.017.459 I have also been using it for a year and it has more advantages.