... produce light and heavy steel structure buildings in protal frame and dome frame, such as warehouse, workshop, storage, hangar, chicken ... gym, dormitory building, bus station, gas station etc.Main frame: welded H beam and column ,surface of steel with ... pvc ), gutter, ventilator, deck sheet, foundation bolts, normal bolts,bracket bolts, shearing bolts, high strengthen bolts,nuts, plates, washers , ...