Prime-Line Zinc-Plated Gray Steel Left Single-Arm Casement Window Operator For Steel Framed Windows

This casement window operator is a left-handed aluminum square body type. It has a 9 in. steel arm with a round disc on the tip (some older styles had a small wheel instead of a disc). The disc slides in the Prime-Line part H 3529 casement track located on the bottom of the casement window. It is worm gear driven by a 3/8 in. crank spindle. The matching crank handle that fits onto the crank spindle and installation screws are included. Mounting holes available are 3-7/8 in. and 4-3/4 in. on center.Arm is 9 in. from middle of the guide button to the middle of the crank operator while closedHeavy duty diecast zinc construction with an aluminum finishSteel worm drive gear for durabilityA Phillips head screwdriver is required for installation