Remove a broken bolt with this simple step by step guide. Probably the most frustrating thing is to break a bolt and have part of it stuck in the hole. With the right tools, you can pull that bolt out with little or no damage to the hole.
5 Get a good set of extracting bits. I've used some of the cheap ones and the old saying, "you get what you pay for" really applies to these tools. You don't want to use a drill bit that is large enough to remove the threads on the broken bolt otherwise you will have a really difficult time removing the bolt. You also run the risk of drilling into the hole which will ruin the hole
As you turn the extracting bolt counter-clockwise, it will dig and grab into the broken bolt and begin to pull it out. This may take some time and effort. If the bolt is a large one, you may need to drill a larger pilot hole and use a larger extracting bit. Be patient here because if you over-drill the hole, you could end up ruining the hole and threads that are holding the bolt.