It's good for doing tension settings and for gripping rings on the inside to drill through but for holding rings externally, I prefer the wooden clamps because the jaws on the external end I think are a bit small.
You can certainly give it some welly to get extra grip when you need it though.
I bought mine about 10 years ago and, unfortunately, I can only find them for you from my auntie's children, who I fell out with.
Cousins UK - Ring Holding & Clamping Tools
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