MIMIVIVA 6 Pcs Damaged Screw Extractor Kit and Stripped Screw Extractor Set. Its A HassleFree Broken Bolt Extractor and Screw Remover Set Made From H.S.S with Hardness 63-65 hrc

First you want ensure that you are using a bit that is SMALLER than the screw you are trying to remove. That way it has enough room to drill a proper sized hole to extract. Slowly start to drill a hole into the screw head or bolt with the cutting size. This creates a cone shaped hole that makes it easy for the extractor head to grab onto Flip the drill bit to the extractor side. Reverse your drill and start slow to allow the threads to catch. Continue to screw or drill until the bolt or screw is fully removed Within a matter of seconds you easily removed that broken screw without damaging any of your other tools or bits. The high strength steel bit does all the work for you