Stanley Proto J86001 Proto 1-Inch Super-Duty Cold Chisel Made from S2 steel and specially heat-treated for greater strength and durability Hand ground cutting edge to the exact angle for cutting through tough metals 20% larger striking surface than standard chisels directs the power to the cutting edge Longer shank features a knurl for better grip and easy positioning Black oxide finish to help prevent rust corrosion; extending tool life and performance