In flight, the actual docking ring perimeter was covered with insulation. In this case the model displays the
interesting machining of the aluminum docking ring.
See development of this model from design through fabrication.
The Apollo docking ring mounted 12 automatic latches to secure the joined modules.
Astronauts used the blue handles to manually lock or unlock individual latches. The ring also supported the docking probe, and allowed connection of two cables between the Command Module and
Lunar Module. The combined spacecraft could be pressurized securely with the double seal of the docking ring.