CONNECTOR CABLE

These are multi-pole connectors with provision for screw fittings to make semi-permanent connections, 
for example on computer equipment. The D shape prevents incorrect connection.

Note that covers are usually sold separately because both plugs and sockets can be fitted to cables 
by fitting a cover to a chassis mounted connector. PCB mounting versions of plugs and sockets are also available. 
The contacts are usually numbered on the body of the connector, although you may need a magnifying glass to see the very small markings.
Soldering D-connectors requires a steady hand due to the closeness of the contacts, it is easy to accidently unsolder a contact you have just 
completed while attempting to solder the next one!