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Understanding Hollow Metal Door Before delving into the importance of door closers, let's first understand what hollow metal doors are. Hollow metal doors are constructed using sheets of metal, typically steel, that are formed into a hollow core structure. This design makes them exceptionally sturdy, resistant to wear and tear, and capable of withstanding harsh environments. Hollow metal doors are commonly used in commercial and industrial settings due to their ability to provide security and withstand heavy use. The... more