Various unrelated components which can be assembled into a 2 pin plug.
After obtaining a length of twin twisted flex with most of the red cotton covering worn away, the bare end of one wire can be placed into the split pin and shoved into one of the holes in the bakelite base.
The screw cover holds the pins into the base. Of course, this can be unscrewed by anyone to reveal the live pins inside.
Even if not unscrewed, the unsleeved pins are in a perfect position for fingers to accidentally contact them when inserting or removing the plug.
Thankfully, plugs like this ceased to be made decades ago, and no one has anything like this in their home. All of the appliances which had these plugs fitted were disposed of years ago.
This particular plug was found on a table lamp in 2011 ...