I bought this set specifically for a drill press with a small weak chuck. The hex end of these drills means I don't have to tighten the chuck as tight as I would with a round end drill. They're only used occasionally so I can't say how long they will last, but so far they can handle fine drilling in wood, plastic and light metal. The time will show. The price was right. I just wish they came in a pouch or index box for easier storage in the drill's carry case. As long as I'm happy