Andersen&reg; Straight Arm Operator (Left Hand) with 8-3/8" Arm Length in Stone Color (1974-1995) 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