Abbatron / HH Smith 278-103 Connector Binding Post Speaker Terminal Panel Mount Black, W21

Electronic binding posts are a versatile electrical connector used to create secure connections for wires in audio, test equipment, and other electrical devices. It is used to connect things like speakers to amplifiers, test leads to instruments, or to transmit power to a breadboard, and it accepts a variety of connections like bare wire, or spade connectors.