Stainless steel is often used as a railing material, especially where corrosion resistance is a major concern. Stainless steel tube and pipe railings are not extruded as some would think, but rather are fabricated from stainless steel sheet material complying with ASTM A480/A480M - Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip. Within ASTM A480/A480M are established finishes for stainless steel sheet and plate, with the most common architectural finishes being No. 4, No. 6, No. 7, and No. 8. Stainless steel sheet used in the fabrication of tubes and pipes for railings typically has a No. 2D - Cold-Rolled Dull Finish or a No. 2B - Cold-Rolled Bright Finish.