That longboard looks extremely nice built up.
I'm in the process of my apprenticeship as a Journeyman. Nothing spectacular, just some stab pins for a job, since my mother wanted to know what I was learning. Since shes curious like that.
These get hardened, Ground, then black oxidized. (Basically Gun Blue)
They end up coming out of bushings to check certain areas of parts to make sure they are to tolerance/size. Stab pins made from 0-1.