Larry is correct, find a supplier that serves commercial customers. I maintained an all chain mooring for over twenty years for our sailboat and only purchased shackles, etc from Marine Supply and Oil on Riberia St. St. Augustine. They supplied the shrimp boat fleet and the shackles had to be the best quality, bad news travels fast, and the shrimpers lives and gear required the best quality. Beware of any shackles made in China, I don't remember the name of the shackles I bought but the pins where painted orange and they would outlast the 3/8 chain I used on the mooring. The mooring and the boat rode out several tropical storms and near misses from hurricanes.
Bill
Bill
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