Multifunctional damaged screw extractor set: This GERYOWIF 6-piece set contains a complete set of tools to effectively deal with stripped or damaged screws. It has 6 pieces of HSS 4341 screw extractor remover kit (#0, #1, #2, #2, #3, #4) Industrial grade quality: Made of heat treated industrial grade high speed steel HSS 4341#, 30% harder than standard carbon steel extractors. Resists wear and deformation even when removing heavily rusted screws. Complete solution: This 6 piece screw extractor set (#0, #1, #2, #3, #4) is suitable for any size drill, screw and bolt (3-12mm). This bolt extractor kit is designed to drill out and remove the most stubborn stripped, damaged, embedded, rusted or painted screws and bolts. Smart design: Patented left hand spiral groove provides 2x the grip while the tapered end ensures instant bite. Hex shank prevents drill chuck slipping. Mirror polished surface reduces friction. Easy to Use: Just two simple steps to get the job done - drill a hole with the cutting size using the correct size screw extractor, then use the removal tool to easily remove the screw or bolt Hardness 63-65HRC: Titanium alloy hardened steel material, more durable than most screw extractors on the market, the hardness and durability are superior to other materials, please buy with confidence and complete peace of mind Universal Compatibility: Suitable for all electric drills (1/4-inch and 3/8-inch chucks) and hand drivers. Great for automotive brake work, furniture assembly, plumbing fixtures, and mechanical maintenance.