... , 120, 130mm or as customers’ requirement.5Surface treatmentUntreated, Hot dip galvanized, Cold dip galvanized, Painted, Powder coated, ... percent, more than twice of cast iron products. Hot-dip galvanized treatment: Good rust-proof property, maintenance ... span, sizes and shapes.Surface Treatment:Untreatment: blackTreatment: hot dip galvanied Hot Dipped Galvanized Flooring Steel Grating Manufacturing