12mm was the spec that came up in tables and online calculators for a 3 tonne boat and I have used the blue version of this rope in the past without any problems. I prefer rope that floats as I dock often on my own and do not want to risk a sinking rope fowling the screws. This white version is smart looking for a boat as blue always looked a bit 'commercial', more suited for use with an H.G.V.Matt (7 Mar 2017, 19:46)
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