I bought two pairs to hang two kayaks on 4" x 4" racks outside on the river. They seem pretty sturdy and hold the kayaks tight. They were easy to install. I pre-soaped the screws and drilled the holes. I had no trouble removing the heads. I've only had them for a few weeks so can't comment on how well they're holding up in the elements. But judging by the looks, I think they will succeed. I recommend these kayak racks!
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