A Screw Extractor is a tool for removing broken or seized screws and bolts. A spiral screw extractor is itself a coarse-pitched tapered screw thread. They are generally left-handed, for use on right-handed threads.
The screw is first drilled out to the proper diameter for that extractor. The extractor is then inserted into this hole and turned in the direction opposing the stuck screw's original one, usually using a tap wrench. As the extractor is turned, the flutes on the tool dig into the screw, causing it to lock tightly and withstand the applied torque required to remove the screw.
Bolt Size: 5/16″, Drill Size: 5/32″, Overall Length: 2-11/16″
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