M. c. NICHOLS. . Perforated Metal. McNICHOLS carries the largest inventory of Perforated Metal products in North America with a vast selection of sizes, gauges and hole types available. In both high-end and industrial settings, Perforated Metal brings strength and style to enclosures, partitions, sign panels, guards, screens and other structures. This dynamic product line offers ventilation, temporarytility and a high strength-to-weight ratio.