Casement window crank operator for metal framed windows. Gear housing is "Teardrop" shaped. Operator attaches to the metal window frame (facing inside the house). Operator arm extends through a slot in the metal window frame. The round guide button at the end of the operator arm attaches to a track channel on the underside of the window. Window track is not included. This is available in two different installation types and can be found under related products. Included Casement Window Operator Parts: Operator gear housing and arm assembly. Crank handle (5/16" spline). Attachment screws. Dimensions: Overall length of operator gear housing and arm assembly, as shown in photo, is 12". Length of arm is 9" (measured from pivot point to center of round guide button on end of arm). Gear housing measures 5-1/8" by 19/32" tall by approximately 1-3/8" wide. There are two sets of screw holes. Screw hole center-to-center spacing is: Set one: 3-13/16" Set two: 4-11/16" Handing: Some suppliers hand their merchandise differently than others, so please rely on the photos shown on this web page to determine the hand of operator you need. Selecting a handing and finish option from the drop-downs above will show the operator you will receive. If you have any questions please feel free to contact us.