Roto X-Drive Dual Arm Casement Operator For Vinyl Window Application.
This operator has a Hex shaped spline protruding from base
Brand: Roto Hardware
Arm Length: 11-27/64" from housing to middle of arm
Base / Arm Height: 9/16"
Handed: Yes, Left and right handed applications as shown in photo
Note: There is another operator used for wood window applications that looks the same