Prime-Line H 3502 9 inch, Aluminum Diecast, Casement Operator, Left Hand, Teardrop Type Product Description This casement operator features a 9 in. long steel constructed arm driven by a worm gear mechanism. It mounts to the left side of your window when viewed from the inside. It has a 5/16 in. spindle and mounts on 3-7/8 in or 4-3/4 in. hole spacingft.s. Used o From the Manufacturer This casement operator features a 9 in. long steel constructed arm driven by a worm gear mechanism. It mounts to the left side of your window when viewed from the inside. It has a 5/16 in. spindle and mounts on 3-7/8 in or 4-3/4 in. hole spacing's. Used o Features Left handed square body crank handle (viewed from inside looking out) Mounting holes 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 closed Heavy duty diecast zinc construction with an aluminum finish Steel worm drive gear for durability Matching crank handle is included USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.