Connectors

[lefty]

I need to make this connection but I don't know what these are called so it's making it difficult to search for the solution. I want to be able to make the connection between these two. I can change one, both or will take a pigtail that converts. It's the nomenclature that escapes me. In fact, it hasn't escaped because that would imply that it was in my head, to begin with. I just don't know what to call them. But I need them to make nice.

Thank you.

https://photos.app.goo.gl/s6baVnisiS4W1GV56

[sean0118]

That's an SAE plug.

I never knew what they were called either, could only remember they are used with batteries. 

[lefty]

Perfect. Thank you.