Feature:1. Using highspeed steel quenching and forging, the hardness reaches HRC60~63.2. With coarse left-hand thread, the pulling force of the screw extractor is strong, better to remove damaged screw.3. The tool is suitable for wood screws, iron screws and steel screws of different strengths. (Level up to 12.9)4. With professional design and reasonable structure, the screw remover can easily remove screws.5. High quality material can make sure the durability and stability of the product.Specification:Item Type: Damaged Screw RemoverMaterial: High speed steelPurpose: Take out broken screwsScope of Application:NO.1: 1/8in-1/4inNO.2: 1/4in-5/16inNO.3: 5/16in-7/16inNO.4: 7/16in-9/16inNO.5: 9/16in-3/4inHow to Use:1. Choose a drill that is thinner than the broken screw, and drill a deep enough hole in the middle of the broken screw with an electric drill2. Choose an extractor the same size as the drill bit diameter, put it in the hole, and rotate it with the wrench3. Use the extractor to screw in the broken screw counterclockwise until the broken screw is unscrewed.Package List:5 xDamaged Screw Removers1 x Storage Box