1、The 4341 high speed steel is very strong and increases the hardness of each bit to help them penetrate hard metal, maintain good sharpness and prevent rust and corrosion. 2、Set the drill to reverse or counterclockwise and use a slow drill. Begin the extraction by using the drill or polishing tip and drill down to create a clean hole. 3、Remove the damaged screws and return your work to normal. 4、Striped screw extractor can even remove the most stubborn peeling, damage, embedded, rusted and painted screws and bolts. 5、It can also be used with drill bits and screws or bolts of any size, fit for stripping, breaking, gluing or damaged disassembly and screws. 6Pcs screw extractor kit can remove all common size damage, peeling or damaged screws and bolts. Features: The 4341 high speed steel is very strong and increases the hardness of each bit to help them penetrate hard metal, maintain good sharpness and prevent rust and corrosion. Set the drill to reverse or counterclockwise and use a slow drill. Begin the extraction by using the drill or polishing tip and drill down to create a clean hole. Remove the damaged screws and return your work to normal. Striped screw extractor can even remove the most stubborn peeling, damage, embedded, rusted and painted screws and bolts. It can also be used with drill bits and screws or bolts of any size, fit for stripping, breaking, gluing or damaged disassembly and screws. Specifications: Material: HSS 4341 Size: 0#, 1#, 2#, 2#, 3#, 4# (6pcs) Item Length: 51mm / 2.01in Package Weight: 97g / 3.42ounces Package Size: 85 * 60 * 18mm / 3.35 * 2.36 * 0.71in Packing List: 6 * Screw Extractors 6 * Screw Extractors