Pella Egress Casement window Operator with 10 inch arm.
Type: Straight Arm - Egress
Handing: Left and Right Handed
Arm Length: 10 inch; measures 11 inches from center of rivet.
Crank Handle and cover sold separately

How to Change Out Your Pella Roto Operator (Video | Article)

EGRESS NOTE: 
This is not a kit to convert a standard casement window to an Egress. This is just the operator.
If you want to convert your window to egress, you need a kit that contains additional hardware.

 
How to Replace the Operator in a Pella Casement Window