... 1.Heat insulation,Enery-saving; 2.High strength structure,Design unique,Making easy; 3.Drainage efficiently,Open instantly Aluminium ... enough pull-resistance and cut-resistance of the profile, good energy-saving effect.2. Design unique, making easy. Outside ... . Adopt wide slide structure, efficiently reduce the load of the pulley, enable swimmingly.3. Waterproof property adopt high orbit structure, ...