Andersen Corrosion Resistant Left-Hand Split-Arm Head Hinge, 20" Egress OpeningAndersen left handed split arm head (upper) hinge with screws and egress control plate for Andersen 400 Series casement windows manufactured 1966 present. If the window was manufactured prior to 1981, you must replace both the upper and lower hinges. This hinge is corrosion resistant and is made with high quality stainless steel, which is ideal for harsh and corrosive environment applications such as heavy industrial or coastal areas. Handing: Left