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Product Specifications: Screwdriver x 6, Screwdriver Drill x 4 Sizes: #0, #1, #2, #3, #4. #0: Compatible Screw Diameter: 2-3mm, 1#: Compatible Screw Diameter: 3-5mm, 2#: Compatible Screw Diameter: 4-8mm, 3#: Compatible Screw Diameter: 5-10mm, 4#: Compatible Screw Diameter: 6-12mm By combining 4 types of screwdriver drills, it can be used with a variety of screws and bolts. Material: Made of high quality HSS (High-Speed-Steel) material. HSS is known as high-speed tool steel, which has excellent heat resistance and welding resistance, and is characterized by resistance to thermal damage such as craters and heat cracks. Excellent durability. It has high abrasion resistance and can be used for a long time. The included iron work screws for drilling are made of titanium coating. Applications: Can easily remove various screws, such as fixing screws, special screw heads and bolts. Suitable for drilling and tapping materials such as light metals, wood, aluminum plates, iron plates, etc. Suitable for all homeowners, woodworking, desktops, artists, hobbyists, etc. Can be used for dismantling furniture at home or work, or for maintaining your car or motorcycle. Features: High hardness screw extractor for easy removal of breakage, rust, lamination, removal, screw breakage, deck screws. How to use: Attach the drill to an electric screwdriver and drill holes into bolts or worn head screws. Then install the screw part to the electric screwdriver and rotate counterclockwise to remove the screws. If the screw head does not have a hole, please drill a hole in the included iron working screw for drilling the included drill into the electric screwdriver, then replace the screws and rotate counterclockwise to remove the screws. Usage Notes: There may be cases where broken screws will not come off if turned at high rotation. Make sure to turn slowly with low rotation and high torque. "