These stainless steel pins have a round domed head and come with either a solid or hollow end.  Hollow end pin is .50" long, solid end pin is .57" long.

The hollow end pin is easy to install; lightly hit the hollow end flat with a hammer after the pin is inserted. The solid pin requires cutting to correct length and working the end into a flange after it's inserted. This is done by lightly tapping the the edges of the pin end with a hammer. Avoid hitting the solid pin end straight on as the pin may bend and not pivot well inside the pin hole.