... 5.Specific application:Steel grating products are designed and manufactured for various industrial and civil constructions ... , more than twice of cast iron products. Hot-dip galvanized treatment: Good rust-proof property, ... 75x10mm2Bear bar pitch12.5, 15, 20, 23.85, 25, 30, 30.16, 30.3, 34.3, ... : BS4592-1987Australia: AS1657-1985 23)HOT SELL!hot dipped galvanized steel grating manufacturer (10 years )