Works with Perma-Shield Casement Windows manufactured from May 1974 to 1995. This #7191-32 Amerock Operator has been upgraded with corrosion resistant components and replaces previous vintage operators with series numbers 7198-17, 1818-2, or 7191 stamped on the back of the operator. The length of the arm from the rivet to the elbow or bend is 8-3/8". This operator fits windows with a visible glass dimension width of 16-1/8". (Andersen CN Size Width ) A right hand operator will have the sash lock on the right side as viewed from the interior of your home. Right hand operator pictured. Includes nylon shoe, cover and screws. Includes stone color operator cover. White cover sold separately part #1351330. Handle sold separately part #0532408 in stone or #1351332 in white. Channel sold separately part #1361204.