This is an adapter board that makes it easy to for an IDC10 socket to be plugged into a breadboard.
The two 5-pin headers either side of the IDC10 box are inserted in to the board first and as if they were going to be component-side headers. Then the board is turned upside-down on a hard surface and hammered through a strip of wood until the pins have been pushed all the way through to the solder side, leaving the pins flush with their plastic housing on the component side.
