Precision cutting edges for soft and hard wire and piano wire. Cuts components like, bolts, nails, rivets, etc. up to 5.2mm diameter. Exceptional cutting performance with minimal effort because of unsurpassingly effective lever action design. Cutting edges additionally induction hardened, cutting edge hardness approximately 64 HRC. Chrome vanadium heavy duty steel, forged, oil hardened These are a high performance plier for the professionals.