1. Handle rotates 90 degree position,glass frame open outwards;rotates to 180 degree 

  position,glass frame outside inverted ventilation vertically;rotates to original position,

  the glass window close.

2.Aluminum alloy window handle, surface all aluminum structure, oxidation treatment 

  process.

3. Concealed heavy-duty hinges,tilt to 15 degree and turn inside to 90 degree  

4. Double anti-misoperation accessories to avoid hardware damage due to wrong operation.

5. High toughness plastic drive bar with lock rod, more quiet in use.