This was the product recommended by San Francisco Marina harbormaster. We bought it and his staff mounted it for us to the fiberglass center pile. We tied a line to it, then departed to boatyard for some work on the boat and when we returned it was gone, just the base was there and our line was in the water. I think they are not robust enough.
Very brittle. Takes no stress. Whey they say "store your lines" they mean it. do not even think about briefly securing your boat to it because it can't handle ANY stress. A medium size wake rolled a 17' Whaler and snapped the cleat. Not good. really is only to used for hanging lines. Bummer,