Holt A4 Stainless Steel Split Rings

I bought the 10 mm rings to link shower curtain rings with the tiny loops coming out of the shower curtain rail. I needed something that won't rust -these seem to fit that bill, having been up for a few months. They are doing that job well. Quite fiddly to slip onto another ring but they are tiny, and the loop they were going round is a lot thicker, and made of plastic. They would easily go onto another thin metal ring which I guess is what they are for.