-With smooth junction, firm connection and tidy assembly and the equal size room theory
-Double-sealed insulating glass;
-The opening way can be changed between the Tilt&Turn between turn ways;
-Can be connected with all kinds of series 60 doors and the using rang of this series is increased;
-Be suitable for producing the combined window, single window and one-unit window frame;
-Carrying the “balanced stress” theory has the excellent airproof and waterproof ability;
-Improved heat-preservation. Sound insulation and less-transfiguration ability;
-The slim frame make the room obtain large lighting area and bright effect.
