Various Sizes -- There are a total of 6 extractors in different sizes for diameter screws. The steel tool extractors have a left-handed spiral flute designed for extra gripping power. Aggressive left-handed (extractors) and right-handed (drill bits) spiral flute design for extra gripping power.>>>Various Sizes -- There are a total of 6 extractors in different sizes for diameter screws. The steel tool extractors have a left-handed spiral flute designed for extra gripping power. Aggressive left-handed (extractors) and right-handed (drill bits) spiral flute design for extra gripping power.Design Concept -- This screw extractor is subjected to a rigorous process, surface polishing, high hardness, high torque. This set is designed for removing damaged, rusted or stripped screws, bolts, fasteners, metal water tap and water tube, etc. High Quality -- Adopt high quality GCR15 tool steel manufacturing which could drill on most screws., Have a long service life. Bit bits can also be used for