Wildly Steel Rd Rod 1/2X48 Solid. Excellent Forming And Welding Characteristics. Cold Rolled Products Have A Higher Yield Strength, Hardness And Tighter Specification Than Hot Rolled Steel. These rods have excellent forming and welding characteristics and are designed for many industrial applications. material allows more precise diameter compared to hot rolled steel rods. Cold rolled steel. Loose. National catalog model No. 4055BC.No. N215368: 1/2'' x 48''No. N215319: 1/4'' x 48''No. N215327: 1/4'' x 72''No. N266072: 1/8'' x 48''No. N266080: 3/16'' x 48''No. N215350: 3/8'' x 48''No. N215343: 3/8'' x 72''No. N215335: 5/16'' x 48''No. N301150: 1/4'' x 36''No. N301192: 1/2'' x 36''No. N301242: 1/8'' x 36''No. N301259: 3/16'' x 36''.