... workshop, storage, hangar, chicken shed, steel shed for market and ground parking, supermarket , high rise steel office buiding, factory , plant, ... building, bus station, gas station etc.Main frame: welded H beam and column ,surface of steel with painted or galvanized ;Purlins ... slding door or electrical roller door etc.Accessories : down pipe (pvc ), gutter, ventilator, deck sheet, foundation bolts, ...