1. Meterial:SS304 .SS301 ,SS202 ,SS201 .

2. All rivet joints are spun-riveted with special nylon washers in between for extra smooth action

3. Be suitalbe for UPVC windows and ventilators.

4. Operates normally after 30000 times strict opened/closed.

5. It provides adequate friction at all opening angles.

6. Available for left and right hands.

7. All friction stays are tested to rigorous salt-pray test for protection against corrosive atmospheres.

8. Fine workmanship .Easy to install.

9. Reliability is our strong point..

10. The products are conformes to national technical standard QB/T3888-1999 for <Aluminum Alloy Stainless Steel Window Hinge>.