Sorry Roy/Steve …
I answered your question [ Does anybody know ] literally, by giving you that link
Most, but not all, of the cutters have 7mm bore
Most, but not all, of the cutters are around 20-25mm diameter
Some of the descriptions have drop-down lists offering the alternatives.
Some of the descriptions have helpful diagrams: e.g. **LINK**
Radiused Tooth Rachet Cutter
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MichaelG.
Edited By Michael Gilligan on 09/01/2019 09:47:30