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Product Description This casement operator features a steel worm gear and a 9-1/2 in. arm. It has a square body style and includes a crank handle. Easily mounts on the right side of your window when viewed from the inside. Used by many wood window manufacturers. From the Manufacturer This casement operator features a steel worm gear and a 9-1/2 in. arm. It has a square body style and includes a crank handle. Easily mounts on the right side of your window when viewed from the inside. Used by many wood window manufacturers.