1.Material:mild steel,or stainless steel 2.various of steel grating styles 3.Color:many 4.Standard: ASTM 5.ISO:9001:2000 Stair Tread Steel grating Feature:1.Attractive appearance : clear and smooth figure, silvery appearance, modern-styled.2.Optimal drainage: Leaking area can reach 83.3%, which is as twice as cast iron.3.Galvanized surface: rust-proof, anti-corrosion,Maintenance convenient.4. ...