... other construction.2.Materials:Mild carbon steel provides an economical, high strength for uses in most industrial ... with hinge offering security, safety and open convenience..High strength: The strength and the toughness are much ... , A569, Q235, S275JR, SS304, Mild steel & Low carbon steel, etc5Surface TreatmentBlack, self colour, hot dip galvanized, painted, spray coating6Grating StylePlain / Smooth ...