... , Mr.David +13757445098 galvanized structure mild steel grating ladder ,hot dip galvanized steel grating , steel ladder, steel grating.ISO9001-2000Company, GRATING SPECIALIST, ... A36, A1011, A569, Q235, S275JR, SS304, SS400, Mild steel & Low carbon steel, etc 5Surface TreatmentBlack, self colour, hot dip galvanized, ... 2006 Japan: JIS (Mr.David Huang) galvanized structure mild steel grating ladder