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high-quality material high-carbon steel, ensuring a longer service life and longer durabilityUsed to remove 1/2 inch and 3/4 inch damaged, rusted or peeling screws, bolts and fasteners of water pipes. Also suitable for ordinary screw removal.The special design provides excellent torque and can be used to turn deep fastener screws. Provides maximum gripDurable and stable: The surface of the bolt remover is phosphoric acid treated, blackened, strong and durable, not easy to rust. Overall heat treatment, high hardness, strong and durable, not easy to break.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.Package Includes: 6 x Broken Bolt Extractor, Screw1X Dual-use Water Pipe Screw Removal