These drill bits work well for deeper 1/8" holes in softer materials like wood. For drilling harder, finer materials, I use short 1/8". -Bits with impact as one might think these longer Bosch bits are more likely to break due to a long thin drill.Bosch drill bits are a bit brittle (brittle) which is the reason for removing a star.Much longer HSS -Jobber 1/8" drill bits tend to be stronger, but must be inserted directly into the drill bit, which is much less convenient. It could be both. A heavy