Haven't used them yet but when I opened the box I saw that the blade on the largest (all blades are the same size) is so short that there are actually only two of the three set screws wait a minute. There had to be a longer cutter to accommodate the larger slot. Also, the included hex key doesn't fit snugly in the set screws and is so flimsy that it rounds almost instantly. Otherwise they appear to be of good quality. I will add more after using them.