Aluminum alloy doors and windows accessories quality is not good, with a year or two began to deformation, loose, a pile of trouble will follow. At ordinary times switch aluminum alloy doors and windows are inseparable from accessories.  

Choose high grade aluminium alloy door window profile to go up even tie-in high grade aluminium alloy door window fittings, ability lets the life of aluminum double pane windows get prolong.  It is good to choose hardware fittings of high grade aluminium alloy door window so.