-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.
