Andersen left-handed split arm sill (lower) 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. Fits CW35-CW6 and CX35 with a 20 inch opening.Handing: Left handed; when viewing window from outside the home, the hinge will be located on the left side. Window Opening Size: 20" Track length: 11-7/8"NOTE: These parts require the Hinge Replacement/Conversion Instruction Guide from Andersen. View instruction guide or watch video here. Related PartsHead Hinges:1361463 - Standard Left Head1361462 - Standard Right Head1361467- Corrosion Resistant Left Head1361466 - Corrosion Resistant Right HeadSill Hinges:1361469 - Left Sill, Standard1361468 - Right Sill, Standard1361471 - Left Sill, Corrosion Resistant1361470 - Right Sill, Corrosion Resistant