These durable 3mm lock nuts are essential replacement parts specifically designed for UDI RC vehicles, ensuring secure fastening of critical components. Featuring a robust nylon insert, they provide superior resistance against loosening caused by vibration and impact, maintaining reliable performance during demanding RC action. Ideal for securing axles, wheel hubs, and other vital connection points, these nuts are manufactured from high-quality materials for long-lasting durability in demanding RC applications. They are an indispensable item for maintenance or upgrades to keep your RC model performing at its best.