Designed for commercial, industrial, and residential applications. Excellent forming and welding characteristics. Mill finish. 1/4" thickness. National catalog model No. 4202C. No. N247239: Slotted?: No, Material: Aluminum, Finish: Mill, Width: 1", Thickness: 1/4", Length: 4' No. N247247: Slotted?: No, Material: Aluminum, Finish: Mill, Width: 1", Thickness: 1/4", Length: 6' No. N258244: Slotted?: No, Material: Aluminum, Finish: Mill, Width: 1", Thickness: 1/4", Length: 8'