Aluminum alloy doors and windows accessories is the heart of aluminum alloy doors and windows: aluminum alloy doors and windows in the home with a long time will be aging, hinge fracture, related hardware accessories (hand, a word lock, etc.) start the phenomenon of inflexibility, resulting in aluminum alloy doors and windows are not tight. 

And our household necessities: aluminium window set also have a period of life, aluminum alloy doors and windows will also be with the passage of time, there will be different degrees of aging.