... made by pressing and welding,surface treatment should be untreated,painted or hot dipped Galvanzied Specification:steel grating No.ItemDescription1Bearing Bar25x3 ... & Low carbon steel, etc5Surface TreatmentBlack, self colour, hot dip galvanized, painted, spray coating 6Grating StylePlain / Smooth, Serrated /teeth, I bar, serrated I ...