They are very durable. We were looking for clips to attach our pool cover to our Intex pool which is 15ft wide and 48" deep, the bars around the top are about 5" round and they work great for attaching the pool cover! They are also great for attaching a hose to a pool fill ladder! The only reason I didn't give it 5 stars is because the orange grips covering the tops slip off easily, which didn't happen when we used it on the pool cover but did when we used it around nailing the hose to the pool cover Stairs. What could the water be.