Suitable for a variety of RC model cars, such as 14209, 14210, 16440, etc. The size is 4x5x12mm, with high processing precision, firm assembly without shaking, and effectively improves the stability of the drive system. Made of aluminum alloy, it is both light and high-strength, corrosion-resistant and not easy to deform, suitable for high-speed operation scenes. Suitable for daily replacement, maintenance or upgrade of model car players to improve the performance of the wheel set and the appearance of the whole vehicle. The set contains 8 adapters, which are enough to meet the replacement of the entire wheel set of a four-wheel drive RC car or as a spare part.