The Forney 45460 Super Ni-Cast 55-percent nickel is the ultimate rod for all known grades of cast iron. Great for joining heavy or thin sections to steel. The computer controlled coating produces welds that represent the optimum balance between tensile strength and machinability. Typical applications include welding grades 30, 40 and 50 gray cast irons - all thicknesses in all positions. Forney Industries is one of America's longest operating family-owned metal working product companies. Founded in 1932, Forney offers more than 5,000 products for the hardware, automotive, farm and ranch and do-it-yourself markets. If you've got metal working questions, we've got answers. We're committed to your success regardless of location size or needs. 3/32 inch (2.38 mm) rod diameter. 1/2 pound (.23 Kg) box of rod. Tensile strength is 70,000 PSI. Amperage: 50-80 amps. Hardness: E-NiFe-Cl. Recommended polarity: DC reverse or AC. Proof of purchase required. neglect, negligence or accident, or that has been used in any way contrary to the purpose intended.