Andersen Corrosion Resistant Right Hand Sill Hinge, 20 Inch OpeningAndersen split arm sill (lower) hinge with screws and egress control plate for right handed 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 (uses standard split arm upper head hinge). Fits CW35 CW6 and CX35 with a 20 inch opening. This hinge is corrosion resistant and is made of high quality stainless steel, which is ideal for harsh and