First: handles pay attention to contrast, set off the United States;
Second: no defects in appearance, good plating effect, smooth feel;
Third: hinges, slides, locks repeatedly open, see its flexibility and sensitivity, the degree of stiffness;
Fourth: Compare the weight of the lock with your hand, and the heavier it shows that the material used for the lock cylinder is thicker and more wear-resistant;
Fifth: curtain track material should be thick, safe to use, convenient opening and closing;
Sixth: aluminum alloy door and window accessories materials, specifications, models meet national standards; floor springs should be stainless steel or copper; door locks should be double-sided security lock; push hand material is stainless steel, aluminum or copper, pulleys and The slide rails are made of hard nylon or galvanized steel products; the sealing material is sealed with a rubber strip and a waterproof sealant is used.
Door and window stainless steel window aluminum alloy
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