If you are using a sump tank in a reef tank it will have at least 1 pump if not more. My stainless steel clamps were stainless steel but no screws, just clamps. Rust caused all sorts of problems. I found this a great solution. Non-toxic to fish and corals. Firmly holds braided vinyl tubing to pumps. No leaks, no chance of rusting and loads of extras for the future.