I think that one is to let the lighting out. It should be big I think on my boat it is a braided thing maybe #6AWG? Maine Sail could probably tell you exactly what you need to be compliant with ABYC.
For a main lightning conductor, the now retired FSU lightning 'guru' recommends a minimum 4 AWG conductor rated for 600v; strongly recommends 2 AWG.
The bonding connections at a minimum 6 AWG.
Youll note in the details found in the above URL, his preferences are for release of a strike though what he calls 'side arc' dissipator electrodes installed along the waterline. His recommendations are usually 'ahead of the curve' ... and are 'controversial'.
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