National Material LP

Block Steel, located in Skokie, Ill., is one of the largest aluminized steel distributors in the United States. The company stocks aluminized stainless, hot dipped galvanized, cold rolled, HRP and distribute tubing. Its inventory averages more than 25,000 tons, which helps expedite orders. The company operates a 165,000 square foot service center with a 72' slitter and 60' multi-cut blanking line. Block Steel's roots began in the 1920's when Albert Block started one of Chicago's first steel warehouses. In 1948, with the assistance of his son Harvey and son-in-law Oscar Wolfson, he founded Block Steel in Forest Park, Ill. Its Samson Roll Formed Products division is one of the oldest and largest custom roll formers in the United States.

Founded in 1953, The Marmon Group is an international association of more than 100 companies that operate independently within various business sectors. It serves clients in the building wire, food service equipment, highway technology, retail store fixture, industrial, distribution, construction and transportation services sectors. The company s member businesses employ more than 22,000 people and operate over 250 production facilities in the United Kingdom, North America, Europe and China. The Marmon Group provides consulting and administrative services, including tax and accounting, legal counsel and management consulting to member companies. Its member companies include Sterling Crane, Silver King Refrigeration, Comtran Corporation, Owl Wire and Cable and Deerwood Fasteners International.

Founded in 1927, Mapes & Sprowl Steel is one of the leading service centers in the United States. The company specializes in enameling steel for porcelain-coating applications and silicon steel for electrical applications. Mapes & Sprowl Steel is a member of the Steel Service Center Institute (SSCI). It maintains one of the largest enameling steel inventories of any service center in the industry. Mapes & Sprowl Steels is a full-service supplier of electrical steel sheet and coils, including fully processed, semi processed, cold rolled and CRML electrical steel.