What is that, the electric iron, a small tube, very thin, and when it is welded, insert the component pin to get the pin out of the tin?

Use the iron to melt the components, pins, tin, and then insert the small tube into the stitches, and then pull out, you can separate the stitches and the tin, and then the pin comes down. What is this thing?

What I've seen is using a syringe needle in the hospital. In addition, some electric irons have a special suction head.It feels good to use a syringe needle, but remember to choose a bigger one.

Two stage tubes, or other electrical components

Needles for injection.