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Product Description This casement operator features a 9 In. square steel arm with a 3/8 In. spindle. The arm is driven by an included crank handle an a worm gear mechanism. Easily mounts to the right side of your window when viewed from the inside. Used on Steel Framed Wind. From the Manufacturer This casement operator features a 9 In. square steel arm with a 3/8 In. spindle. The arm is driven by an included crank handle an a worm gear mechanism. Easily mounts to the right side of your window when viewed from the inside. Used on Steel Framed Wind