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Close to 1/18 Scale two different 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 Front Axle Wheel and Center for Trailer Axles Wheel.
Overall Diameter about 1 1/8 inches (28.6 mm.), then this is closest to 1/18 Scale.