Different roof panel machines can produce different shapes of steel roof, wall sheets according to the clients' profile drawings and requirement. Steel roof, wall sheets are new building materials with various thickness and colors. They have many advantages, such as low cost, easy installation, short building period, re-cycle use, beautiful appearance, and are light weight but high strength. They are used as the roof and walls of gymnasiums, airports, theatres, factories, warehouses, garages, exhibition centers, etc.