Deutsch Connector.
This harness is compatible with the following RIGID Industries LED Lights: 10" E-Series, 10" SR-Series, 20" E-Series, 20" SR-Series, 30" E-Series, 30" SR-Series, 40" E-Series, 40" SR-Series. It features battery terminals on one end and a Deutsch connector on the other to connect to the light. Wire Harness f/10"-30" Light Bar.