Nice bit set. Used them to drill out some broken exhaust manifold bolts with an angle drill. Like all other bits, they get longer as the bit size increases. I had to trim the stock to the last size I used to get in the right area. Don't run them too fast on the metal, it will burn them out. I don't think they're the sharpest standard bits I've ever used, but I've sharpened them with a drill and they drill much better. Overall good beats.