These Schumacher Racing Products M4 steel nyloc flanged nuts are a factory replacement hardware item for Schumacher 1:10 RC vehicles. The nylon insert lock design resists loosening from vibration, while the integrated flange distributes clamping load over a wider surface area. Sold as a pack of four nuts with a 4.0mm thread pitch. Features: M4 thread size Nylon insert locking mechanism for vibration resistance Integrated flange for wider load distribution Pack of four nuts Metal construction 7/7/26 cs