Specially Prepared Ferrous Metal Products, Not Capable of General Use-Namely, Sheets, Strip, Commercial Coils, Plates, Commercial Shapes, Rods, Wire and Commercial Fabricated Parts, for Use in Building, Transportation and Drainage Construction and Particularly for Use in Assembly of Trailer Body Sides and Roofs, Pullman Cars, Freight Cars, Hopper Cars, Aircraft Parts, Aircraft Fire Walls, Exhaust Ducts, Carburetor Rings, Marine Hulls and Hardware, Straight Seam Pipe, Spiral Seam Pipe, Culverts, Corrugated Pipe, Arches, Pipe Arches, Tunnel Liners, Guardrails, Retaining Walls, Water Control Gates, Piling Buildings, Tanks for Storage and Chemical Processing, Reinforcements for Concrete Walls, Boilers, Liquid and Pressure Vessels, Deck Plates, Bridge Decking, Fences, Reinforcing Bars and Light Wire for Concrete Forms, Steel Joists and Structural Bolts