Er, I think you're mis-reading the description: there is no mention of the bore diameter in the plug (which is the standard 'F' rod simulator used on wire aerials and the 34-ft mast (etc.) Aerial Feeder No.9 that mates with the aerial base.
The description lists the outside diameter and length of the nickel-plated brass plug, and the length of the knurled portion. Nothing about the internal bore for the core of the connecting cable.
The wire aerials had the end simply inserted and soldered; Aerial feeder No.9 had the central hole tapped for a (2BA?) screw to take a tag and lock washer, and other cables had a plain central hole cross-drilled and tapped for a grub screw.
The lug on the other end would be soldered and then either crimped around the cable jacket, or sleeved/whipped with twine for a suitable fit.
Best regards,
Chris.
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