a. material: mild steel , stainless steel, aluminum b .treatment :powder coating,painting, hot galvanized c. becautiful ... bending, CNC shearing , Welding, surface treatment.2. Materials: stainless steel , carbon steel, CRS, HRS, Aluminum 3. Surface finish treatment : zinc/nickel/chrome ... report, dimension report.5. Customized designs are available8.MOQ: 10 steel stairs