... durability style engineered for school ,house ,factory 1.profile:aluminium alloy6063-T5,powder coating (or anodizing) ,,wall thickness: ... prevent outdoor noise effectively.After surface processing, the window and door have strong weatherability, ageing resistance,and high ... connector, convenient assembly. Opening way diverse,such as Casement,Tilt-turn,Single/double hung,Sliding,Folding,Special opening ...