22-piece set screws left-handed extractor set extractor tool screw extractor Features: With the support of an extension and a base adapter, you can interchange the separately designed drill and extraction inserts at will without wasting time and energy. This 22-piece screwdriver for damaged screws is made of HSS material and offers many ways to loosen broken screws or bolts of different sizes (1-12 mm). It can also handle irregular and jagged screws and bolts, full specifications. HSS material with maximum protection against rust and corrosion is used. The hardness can reach 64-65 HRC for optimum strength, flexibility and durability. The notches on the extractors generate more force on screws that are difficult to remove. Packed in a neat and durable clear plastic box. The extractor set's extension bit holder (6.35 mm) and base adapter (4 mm) will fit any brand of drill/driver. The magnetic field in the holder and adapter prevent the inserts from falling off. Warm tips: The extension bit holder should be used for large bits 6.35 mm (No. 1 ~ No. 5) and the adapter for small bits 4 mm (No. 6 ~ No. 10). The adapter can be fitted into the extension bit holder if required. Each drill bit has its own customized extractor, please do not mix up. Please set the drill / screwdriver to the lowest speed if you want to loosen the screws. Less than 400 rpm is sufficient. A wide range of bolt or screw heads is covered (cross, slotted, Torx, square, hexagonal, safety Torx, etc.). Wide range of applications for screws or bolt sizes as follows: No. 1 for diameters 6.0 to 12 mm - No. 2 for diameters 5.0 to 10 mm No. 3 for diameter 4.0 ~ 8.0 mm - No. 4 for diameter 3.0 ~ 5.0 mm No. 5 for diameter 3.5 to 6.5 mm - No. 6 for diameter 3.0 to 5.5 mm No. 7 for a diameter of 2.5 to 4.5 mm - No. 8 for a diameter of 2.0 to 3.5 mm No. 9 for a diameter of 1.5 to 2.5 mm - No. 10 for a diameter of 1.0 to 1.5 mm Package: 1 x set of 22 screw extractors 1 x storage box