I just received these yesterday and used them for the first time today. Not very impressed that the 1/8" bit after drilling steel pipe broke after drilling about 20 holes. I wonder if there is a guarantee on them. They aren't much better than the titanium drills I've used in the past. I really like how the case and drill bits look. I almost didn't want to use them because they were so pretty. Maybe I shouldn't have used them at all.