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Type : Screw Extractor Material: Carbon steel Size: 3mm-6mm(1/8"-1/4") 6-8mm(1/4"-5/16") 8mm-11mm(5/16"-7/16") 11mm-14mm(7/16"-9/16") 14mm-18mm(9/16"-3/4") 18mm-25mm(3/4"-1") Quantity:6pcs Reverse thread for removing broken screws. These extractors remove most damaged, rusty, damaged or stuck screws from wood or metal surfaces with relative ease. Usage: 1.Choose a rotary head thinner than the broken screw and drill a hole deep enough with cobalt in the middle of the broken screw. 2.Select a extractor of the same diameter as the drill bit, put a wrench into the hole and rotate. 3.Use the extractor to turn the broken screw counterclockwise until the broken screw is removed. Note: Need to cooperate with the winch.