I had a key chain with these little S biners on it and the small biners broke over time (usually through misuse). I bought this group as a replacement, and I love them. They are tough and if you don't hit them with hammers or pinch them with your channel locks (thanks kids!) they stand up pretty strong. I like them. I use them every day. I think this is a great way to keep multiple keys on one ring without having to search through the lot of them.