... International Standard Size Screw is Include. Friction Stay Window Hinge Fire EscapeLengthStack HeightTrack WidthScrew Size304mm, 405mm,12”,16”13 mm, 17 ... "16mm, 25mm,0.6”,1”This Friction Stay Window Hinge Fire Escape is only suitable for side hung window.A UPVC window ... the window allowing near twice as big a gap to escape through.