Founded in 1956, Diamond Perforated Metals is one of the largest manufacturers and distributors of perforated and expanded metal in the United States. It offers a range of stock items in aluminum, stainless steel, brass, copper and plastic materials. The company provides a variety of degreasing and notching services. Diamond Perforated Metals offers bolt holes and administers a blanket order program. It also offers precision leveling, coating, shearing, slitting, stamping, blanking and welding services. The company provides perforating tools, cluster and punch die sets in various patterns, including round, square and hexagon. Diamond Perforated Metals has received an ISO 9001:2000 certification from the International Organization for Standardization. The company is a part of Gibraltar Industries.