Damaged Screw Remover and Extractor Set by SKmoon,Easily Remove Stripped or Damaged Screws. Made From H.S.S. 4341#, the Hardness Is 62-63hrc,Set of 4 Stripped Screw Removers An essential part of every tool kit box and comes with a Lifetime guarantee Your damaged screw remover set is backed by our Highest Quality Promise. Easily remove stripped or broken screws Screw Rem,Made of durable hardened steel. The 4 piece screw extractor set works with any drill and any screw size or bolt,Great for stripped. Made from H.S.S. 4341#, the hardness is 62-63HRC