RIDGID cast iron electrodes come in a 1 lb. (0.45 Kg) pack of 1/8 in. (3.2 mm) stick electrodes. They are EStCl non-machinable cast iron. Nomacast is specifically developed for welding dirty, heat-affected, contaminated and oxidized cast iron where machinability is not required. It bonds to oil impregnated cast iron due to its non-conductive flux coating and nickel-free metal composition. It can be used to fill in large holes or join steel to cast material. Its tensile strength is 62,000 PSI and the recommended amperage is 70-125 amps. The electrodes are direct current electrode negative (DCEN) and alternating current (AC).