Tool steel includes varieties of carbon alloy steel that are suitable for making tools due to their high heat and abrasion resistance. These highly durable metals come in CPM, CPMS-60V, O1, and A2 types. CPM tool steel is available in mill, blanchard, and precision finishes, offering greater impact resistance than A2 and D2 steel. Still, A2 steel is a fine grain, electric furnace air-hardening, 5% chrome oversize precision steel that features excellent wear and abrasion resistance. CPMS-60V is designed from a 440C stainless steel base with added high carbon and vanadium, which increases wear resistance. O1 is a general purpose tool steel well-suited for knife blades due to its abrasion resistance, toughness, and machinability characteristics. Tool steel comes in a wide selection of sizes.