Galvanized industrial ladder: 1. P,S,I types 2.mild steel,stainless steel, ... 3.fix by welding or bolts 4.T1-T4 Galvanized industrial ladder: Material: There are mill steel black, hot dip Galvanizing and ... , well cover, trench cover, sump cover,compound gratings, storage shelves, ladder, fences and handrail so on for construction project, oil project ...