Inside steel stiffeners extend the total door width to make sure B18, B16 and B14 Collection flush doors meet up with architectural specifications and market specifications for complete flush and steel-stiffened doors. Our customized metal windows are developed by 3 generations of blacksmiths who forge merchandise to within just one/16” https://www.cargodirectory.co/california/yorba-linda/undecided-category/euroline-steel-windows-doors