Main Steel Polishing Co., Inc. Main Steel polishing is the largest independant toll processor of bright metals in the country with 10 locations throughout the United States. Widely acknowledged as the industry leader, main steel polishing produces a variety of specialized finishes, in addition to slitting and cut to length. Offerings, toll processor, stainless steel, aluminum, brass, copper, polishing, slitting, slit, polish, cut to length, cut, grind, plate, sheet, coil, buffing, pvc, protective tape, bright metals, iso 9000, iso 9002, thomas mallan, service, metal, main, main steel, main steel polishingProcessing, Processor, cutting, buffing, brushing, Red metals, Nickel, Titanium, painted metals, protective film