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 Adapter Exquisite 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: Red Use: Vehicles and Remote Control Toys RC Parts and Accs: Connectors/Wiring Upgrade Parts/Accessories: Wheel Hub Remote Control Peripherals/Devices: Wheel Spacer Widener extension For Vehicle Type: Length: 29mm Material: Aluminum alloy Package Contents: 4 * 12mm Hex Hub 29mm extension Adapter 4 * Screws 4 * Washer 4 * Rubber Ring 4 * pipe 4 * Pins 1 * OPP bag Only 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.