The is a model of a BMW E90 plastic nut. These nuts are used in the undertray, splashguard and several other places in the vehicle.
The nut itself is unthreaded since it is screwed onto a thread cutting fastener. The inner diameter of the nut is 4.25mm. The nut fits a 10mm wrench.
BMW_Plastic_Nut.stl | 162.0KB |