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Got to make a screw in removal tool to pull brake cable through my frame so does anyone know what the bore size is please , swapping sram code r for hope if that helps
I have the answer, but not to your question. What you need is one of these. They come with retail-packaged Reverbs and possibly some other RS/SRAM stuff (you may already have one without knowing).
https://www.bike-components.de/en/RockShox/Barb-Connector-for-Reverb-Reverb-Stealth-p33811/
Also from here although the description appears to be for something else so you might need to check what they're sending. https://www.tweekscycles.com/uk/rockshox-reverb-stealth-barb-connector-srmtls815066030/
Assume you mean hose, not cable. Shimano have two sizes, 2.1mm and 2.3mm. I presume the others are pretty similar.