Screw for safety railing for stairs

[Jgs78]

Hello
I'm having trouble finding the right screw for a protective railing for a staircase. I've looked everywhere without success. Does anyone know where to find the screw according to the picture? What is this type of screw called?

 

[topmount]

Screw pin ?

 

[Jgs78]

Screw pin?

Have looked into that too but would like a head on the screw pin so that it holds the post itself in place.

 

[balloo]

You can buy screw studs and matching sleeve nuts just like in your picture.
E.g.
https://www.hornbach.se/p/skruvstift-6x100-mm-elforzinkad-50-styck/8527221/
https://www.hornbach.se/p/hylsmutter-dresselhaus-plan-med-insexfattning-m6-elforzinkad/7750442/

 

[Jgs78]

Great. Thanks for the tip👍