what is the gauge of cable please, I wish to put a slightly bigger ring terminal on one end.

It's a thin cable, and the value for money is that it is built. Amazon, sorry, but if you have a crimp tool and connectors, you might as well build from scratch. If you need a slightly bigger connector, try mashing the existing one, it's nice soft metal, it won't be a ring but tightening it will be secure.

1.5m Turntable Record Player Earth Grounding Wire to Stop Feedback Humming or Buzzing Hum (1.5 Metre, Black)

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