The one I needed the most to remove the 3/8" bolts broke in two on me. I had to finish the hole/holes with a Russell bit - Jennings which is over 100 years old and braces (significantly newer). I may have put a little lateral tension on it, but if so it was minimal. I've done a couple dozen holes up to this point, so maybe I really shouldn't for Dollars. Another "I guess they just don't make them the way they used to."