... or Galvanized.Punch: Can be punched as customer's drawing Usage:purlin and wall beam of steel structure buildingThe Z-shaped ... of roof and wall in large-scale and mid-scale construction, such as factory, warehouse, garage, exhibition center, cinema, theatre, garden ... ). Eco-friendly material: can be used for several times and can be recycled(6). Shorter construction period, longer using time(7). High ...