Different 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 rigorous process, surface polishing, high hardness, high torque. This set is designed to remove 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. Few bits can also be used for drilling holes on wood, metal, plastic, brick and wall, etc. and machine screws as well as PH, flat, hex or painted on screws and applied to hold household, office, and so on.Easy to Use -- Drill a hole in the center of the broken screw first with a suitable drill bit, then use a suitable extractor to remove the screws. Diameters of drill bits and recommended extraction diameters of broken screws are engraved on the caseGood Notes -- You can use with a tap handle which hold the extractor firmly; for the large extractor, you can use an adjustable wrench. You can use an adjustable wrench to hold the extractor firmly when removing the screw. When using power tools, wear protective eyewear and clothing.Specifications:Material: SteelColor: As the picturePacking: Plastic boxSize: As the picturePackage Included:1 x 6 pcs/set Screw Extractor,"