Prime-Line H 3501 Window Operator, 8 in L x 3-7/8 in W x 13-1/4 in H Dimensions, For: Older Steel Framed Windows, Left

The H 3501 casement window operator is a left hand aluminum teardrop body type. It has a 8 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 H 3529 casement track located on the bottom of the casement window. It is worm gear driven by a 5/16 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 and 4-3/4 in apart.