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Close to 1/18 Scale TWO Center for Wheels. Used by Pacific M25-M26-M26A1 Prime Movers and Tank Transporters "Dragon Wagon" combinations in U.S. Army World War II.
This set depicts the Center for Truck Tractor Front Axle Wheel.
Overall Diameter about 1 1/8 inches (28.6 mm.), then this is closest to 1/18 Scale.