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Package Includes: 6 x Broken Bolt Extractor, Screw extractor size includes #1 for 1/8"-1/4", #2 for 1/4"-5/16", #3 for 5/16"-7/16", #4 for 7/16"-9/16", #5 for 9/16"-3/4", #6 for 3/4"-1.0" . Alloy steel material with high hardness, stable, reliable and it has long service life. Take out various stuck screws by two steps within 10 secs. Use proper size drill bit to bore a hole on screw head, then reverse the remover counterclockwise into the damaged screw until it is released. Aggressive left hand spiral tip design will embed the extractor into the damaged screws for resistance increase, get extra gripping power for easier removal. Can be used with the drill, and the speed can be changed in the opposite direction of rotation of the drill in conjunction