Friction Stay UPVC Hinges International Standard Size Screw is Include. Friction Stay Window Hinge Fire EscapeLengthStack HeightTrack WidthScrew Size304mm, 405mm,12”,16”13 mm, 17 mm,0.51”,0.66”18 mm,0.71"16mm, 25mm,0.6”,1”This Friction Stay Window Hinge Fire Escape is only suitable for side hung window.A UPVC window with this hinge on opens, instead of the opening sash moving to the centre of the ...