Feature:1. Zinc Alloy Material: RC car wheel hex hub is made of high quality zinc alloy material, strong and durable, not easy to damage, having long service life.2. Easy Installation: RC wheel hex hub is easy to install and not easy to twist. Wheel base can be extended or shortened improving vehicle stability.3. Suitable Models: Wheel hex hub is suitable for ARRMA Axial SCX10, for Traxxas D90, for Redcat GEN8 brand cars, suitable for 1.9inch 2.2inch wheel.4. Upgrade Parts: The excellent spare parts for remote control wheel hub modification can upgrade your RC car to help improve performance.5. Good Workmanship: Exquisite workmanship, beautiful appearance, can be fitted with a variety of width tire options and installed on the vehicle.Specification:Item Type: Wheel Hex HubMaterial: Zinc AlloyColor: BlackWeight: Approx. 41g/1.4ozDiameter: Approx. 21mm / 0.8inThickness: Approx. 10mm / 0.4inHex Size: Approx. 12mm / 0.5inCenter Hole Diameter: Approx. 6.7mm / 0.3inSuitable Models: for ARRMA Axial SCX10 / for Traxxas D90 / for Redcat GEN8 brand cars.Package List: 4 x Wheel Hex Hub Note:1. Please allow 13mm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.