1. can be wall or roof panel 2. cheap, economical building material 3.used f4dorm, office, warehouse, fence, factory,workshop This type of plate is an internation all ypopular roofing plate ,with characteristics button type plus seaming,seaming self-licking conjunction,overall hiddenassembly,no exposed screw rapid and convenient Erection,very good section feature ,the life twice that of common ...