Profile: National Foundry & Mfg. Co., Inc. specializes in anchoring systems. We deliver electrical, oilfield and challenger anchors. Oilfield rod is built from Grade ASTM-36 steel. Our models have an eye hot formed 3" by 5" I.D. and welded to the rod. The other end is threaded and has a nut in place to engage pressure plate to open bottom. The rod is produced from 6' to 14' lengths The rod on the Grip Jaw is produced in 6' to 12' lengths and both are available in 1 1/4" and 1 1/8" rod diameters. The rod lengths are determined by soil formation and moisture conditions where the anchor is installed. The eye on the rod is painted with bright yellow enamel. The remaining rod is coated with a mastic asphalt then a plastic sleeve to inhibit corrosion.