This is a pop up drain plug for sinks.
I had a silver plug and wanted to change to a black one. They are quite expensive, so I made one.
It it is designed to fit a M8 threaded insert (outside diameter: 10mm). I used one with 6mm length
I also used the rubber ring seal from the original plug.
I don't know if it necessary, but I spray painted it.
I sprayed in three layers:
-Primer
-Color (black)
-Varnish matt
Still looks great after som months.