KitchenAid mixer worm gear. May have 241803 printed on it and may be gray or yellow. Fits older generation KitchenAid mixers K45, K5, K5SS, KSM90, KSM150, KSM5, KP50P, KPM5, KSM50P, KSMC50S,AND KPM50 and variations of these KitchenAid mixer models.Item #: KA-4162897