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NOT FOR USE ON WAGONS OR SCOOTERS Compatible with 0.375 inch (3/8") diameter metal bike/trike axles. DOUBLE CHECK your axle size since there are other sizes available. The outside of the cap measures 0.875 inches (7/8") and the hole is 0.375 inches (3/8").ONLY for use on the following Radio Flyer TRIKE & BIKE Models: Model 21T Fold 2 Go TrikeModel 23 Grow 'N Go BikeModel 21P Pink Fold 2 Go TrikeModel 23P Pink Grow N Go BikeModel 33 Classic Red Dual Deck TricycleModel 33P Classic Pink Dual Deck TricyclEModel 34 Classic Red TricycleModel 34T Classic Red Tricycle with Push HandleModel 46 Classic Lights & Sounds TrikeModel 46G Pink Classic Lights & Sounds TrikeModel 53 Deluxe Steer & Stroll TrikeModel 53P Pink Deluxe Steer & Stroll TrikeModel 440 Twist TrikeModel 8 Little Red RoadsterModel 61 Retro RocketModel 73 The InchwormModel 74 The Steer & Stroll Coupe2 BLACK BIKE / TRIKE hub caps w/ integrated metal lockwasher included.