Steel prefabricated house, Minimum Steel Quantity:Q235,Q345, High Construction Efficiency, Long life time, warehouse, factory. If you need: Options ... rolling shutter (within 10m2) Window Very few Usage Warehouse, workshop Standard and suitable market Africa, Middle-East, ... ) Window Alu. Alloy (can use with skylight) Usage Warehouse, workshop, shopping mall, exhibition hall, super market Standard and ...