1)  Window Frame Dimension and Installation Hole Dimension A4: 78*98 80*100 A6: 78*118 80*120 A8: 78*140 80*142 B6: 114*118 116*120 B8: 114*140 116*142

2)  Invisible gas spring

3)  After special craft processings, the handle looks reliable aritstic, feels extremely good

4)  Perfect treatment on the window handle with smoothy using

5)  Upto 45 degree of opening angle