Excellent quality. Spicy and quite hard. I know this set will serve me for many years. Wanted to give 5 stars but only one problem - a real mistake. . . The cheap case doesn't fit the bits and felt flimsy at first, but upon inspection the knobs on the bottom of the case that hold the bits in place are quite firm. However, my bits arrived in a case in a mess. I am convinced that it is a delivery problem. Since these are metric and standard bits, they all get mixed up. When I put them in the right grips, I couldn't easily tell which was which. Bits might be marked by size, and foam or other stuffing inside might prevent this. I would be the first to buy them if they were bigger.