Works with Perma-Shield Casement Windows manufactured from May 1974 to 1995. | This operator fits windows with a visible glass dimension width of 16-1/8". Andersen CN Size Width | Includes nylon shoe, cover and screws. | replaces previous vintage operators with series numbers 7198-17, 1818-2, or 7191 | This #7191-32 Amerock Operator has been upgraded with corrosion resistant components