Brass terminals.New stylish design.Superior quality.Revolutionary 3 step wiring body.On/off switch incorporated.Fits all standard round 6 or 7 pin trailer plugs. 54642/54648 have in-built LED circuit tester with simple colour coded wiring.Meets performance requirement AS4177.5 2004.Other Details: Part No. Pin Type Size Type 54620 6 Round Small Standard 54622 7 Round Small Standard 54642 7 Round Small LED Indicator 54648 7 Round Large LED Indicator