IH 4" Half Spool with Square Hole for Discs with 1-1/8" Axles 472591R3 Dimensions: Bolt Size: M20 Threaded Female. Bolt hole circle: 4.17" (106mm) (M12 Hole) Outside Diameter: 5" (127mm) For a precise fit and wise selection. Our trusted accessories keep your tools running smoothly. Please confirm your model above before ordering. Double-check dimensions and photos for the right fit. Quality assurance ：Well-designed, excellent processing. Made of highly durable materials, rigorously This is a manufacturer substitution. Functional equivalent to prior parts.Product Description Well-designed, excellent processing.tested, compact & sturdy, longevous. Ultra Durable, Quality Replacement.Made from durable high quality material and well-tested by the manufacturermade from durable high quality material and well-tested by the manufacturer