120 inside and outside flat frame window screen all in one flat window

· The broken bridge thermal insulation profile, heat preservation and energy saving, the inner opening structure can realize the function of 90 degrees opening and hanging. 
· Through linkage hardware and handle, the window sash is fixed on the window frame when closed, with high anti-theft performance, safety and reliability. 
· Simple operation linkage handle, can make the outside of the window to the indoor, can easily and quickly clean the outer surface of the window, through the window sash around the multi-point locking, improve the sealing and heat preservation effect of the door and window.