I bought my first set of these drill bits a few years ago. They eventually wore out and became dull. I lost a few. So I bought the same set again. great set It lasts a year for you. The only criticism is that the bit holders are now made of plastic instead of metal. This was easily fixed with my old mount. The problem is that the new holder has the dimensions of the bits painted over. The paint is peeling off. With the old holder, the dimensions are stamped into the metal. This is my only grip. Otherwise, I highly recommend this set. It works well and lasts. And you'll never have to search for an odd bit size again.