HRC Racing release 4mm gold plugs, designed to be used as output connection for boxes.
These connectors can be used to add plug-in connections to your battery box or to built any other kind of plug-in box, and could be easily installed in plastic or wood box, via inner thread and nuts.
Avialable now by pair, one black and one red:
HRC9004B – Connector – 4.0mm gold – Box Output Style – Female (2 pcs)