"ONE PIECE CARBRON STEEL CONSTRUCTION, TOOTH HARDNESS RC64-67, CUTTING RECOMMENDATIONS: MILD STEELS, ALUMINUM, BRASS, BRONZE, CAST IRON, COPPER, LEAD AND ZINC. USED FOR CUTTING ABRASIVE MATERIALS LIKE CORK, FIBERGLASS, GRAPHITE AND PLASTICS. CUTS GATES, RISERS AND OTHER COMPONENTS MADE FROM NON-FERROUS METALS. EXCELLENT FOR WOOD CUTTING."