Lock center sash window lock , the Federal Central Standard Time key drive of fasteners have been installed on the sash. Obstruction in this section has been designed to double-hung window. We are selling a wide range of screws to prevent or stop the window from opening. Although you can strip the screw to prevent the window opening at all, if you want to open the blade slightly for ventilation, Buramarora stop is ideal for this. Additional insert, so you can reuse the same screws, you will be able to purchase, do not change the position of the window.