1.Applied to top-hung window, comfort to standard of China "Construction Door & Window Hardware Stay Arm" JG/T128-2007. Repeated open and close more than 15,000 times.
2. The new stopper can be locked by fast rotating, it is operated comfortably and positioning can be achieved, improve reliability.
3.Adding reinforcing block and the thickness of rods to achieve higher intensity and stability.
4. Unique fixed block helps easy installation. Fixed on the frame are removable for easy escape in emergency situation.
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