This is actually a very small part I finished modeling for my car model project I am working on. Learned a lot about the pointiness geometry node and used my first displacement modifier.
I had lots of fun modeling this.
Rendered @ 250 Samples.
Wheel Nut Design is a Mercedes Formula 1 Wheel Nut modified a bit with a Ferrari center cap. Center of this nut is complete with textures and threads too! ;)