About the wheel hub adapter: The quick release wheel adapter is 6-Holes Patterns Design. Thick Quick Release Adapter Hub. Durable Material: The quick release wheel adapter material is metal. Durable Material engineered for Car Racing, anti-Scratch treatment to ensure it looks its best for years to come. Release wheel adapter system: 6-Holes quick release wheel adapter have master locking system, Self locking mechanism. Easy to use: NO welding required. NO fiddly keys required. Allows Releasing Steering Wheels by just a Click. International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.