... (twisted bar or round bar)4Cross bar pitch40, 50, 60, 65, 76, 100, 101.6, 120, 130mm or as customers’ requirement ... modern trend.The best drainage: Leakage area of 83.3 percent, more than twice of cast iron products. Hot-dip galvanized treatment ... .High strength: The strength and the toughness are much higher than cast iron. Can be used for terminals, airport and other ...