Extension about 29mm.Easy Upgrade From The Original Part.Enhances model car overall performance.It Is Durable and Can Be Used for a Long Time.Applicable models: Weili 12428-ABC 12429 12423-ABC Flying over FY-01 FY-02 FY-03 FY-04 FY-05 FY-07 Design and hypoallergenic and chemical free 12mm Hex Hub 29mm Extension AdapterExquisite Workmanship 12mm Hex Hub 29mm Extension Adapter: Great for the Children's Christmas tocking fillers, will make your Children very happy and surprised.Also Perfect Festival Birthday Gift For your kids.Color: RedUse: Vehicles and Remote Control ToysRC Parts and Accs: Connectors/WiringUpgrade Parts/Accessories: Wheel HubRemote Control Peripherals/Devices: Wheel Spacer Widener extensionFor Vehicle Type:Length: 29mmMaterial: Aluminum alloyPackage Contents:4 * 12mm Hex Hub 29mm extension Adapter4 * Screws4 * Washer4 * Rubber Ring4 * pipe4 * Pins1 * OPP bagOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.