22 Pieces Screw Extractor Set: Includes 10 pieces drill bits (Dr#1, #2, #3, #4, #5, #6, #7, #8, #9, #10) and 10 pieces extractors (ex #1, #2, #3, #4, #5, #6, #7, #8, #9, #10). 1 piece of extension bit holder and 1 piece of socket adapter, suitable for general sizes and all kinds of broken bits to remove damaged screws or bolts. High Strength Steel: Made of 4241 high speed steel, high hardness, durable, which is suitable for removing stripped screws and broken bolts. Extra Extension: The extension bit holder (6.35mm) and socket adapter (4mm) of the screw removal kit fit all brand electric drills; The magnetism inside the holder and adapter prevents the tips from falling off, fix the drill or extractor and extend the tools to reach what you are trying to drill. Easy to Use: Just need a drill or extractor that is smaller than the damaged screw, and rotate the drill in reverse during this process, you can easily remove the screw Wide Application: The screw removal kit is suitable for most