Roto X Drive Split Arm for Vinyl Window Application.

Brand: Roto Hardware
Application: Vinyl Windows
Arm Length: 8-1/64" from housing to middle of arm
Pin Position: DOWN
Link Offset: Yes
Stack: 9/16" for vinyl windows  
(11/16" stack for wood windows, see # 572040)
Handed: Yes, Left and right handed applications as shown
Colors/Finish: White
Optional Colors: Almond, Blue White, Dark Brown, Earth Brown, Oil Rubbed Bronze

Note:
The X-Drive and Pro Drive are the same operator that uses a different crank handle.
The Pro drive operators have a hex shaped hole in the operator and the handle with a 5/16" hex stud pushes into operator.
The X-Drive has a 5/16" Hex spline that protrudes from the base and the handle fits onto it.