Yes, they break. But that's because they're so small. That's why I appreciate the ten pack. It's #69, which is perfect for 22 gauge wire. I use these drill bits to insert size 22 stud earrings into my non-metallic jewelry. The little tube they come in is great. It has a little hook to hang it near the drill if you're organized and I'm not. In my case, the tube is great so I don't have to throw out my tin of loose drill bits and have to keep each drill bit next to a piece of wire every time I'm trying to find the right fit. Instead, I can just put the whole tube in a glass! Much easier to find and less swearing as a result.