Damaged Screw Extractor and Remover Set by Aisxle,Easily Remove Stripped or Damaged Screws. Made From H.S.S. 4341#, the Hardness Is 6263hrc,Set of 4 Stripped Screw Removers Your damaged screw remover set is backed by our Highest Quality Promise. Easy removal of rusted, free-spinning screws and deck screws. Easy to use, just two easy steps! An essential part of every tool kit box. The 4 piece screw extractor set works with any drill and any screw size or bolt. Made from H.S.S. 4341#, the hardness is 62-63HRC