This is a hand made chain using punched copper links and saw cut titanium links. I use two 20 ton rotary punches to make the punched rings (for copper this is a little over kill, but the tooling is already set up). I wrap and cut the titanium links on site as well.

This chain is 10 1/4” long, 3/8” on a side with solid machined copper link on the clasp that is 5/8” wide. The 25 mm clip is all titanium with a stainless spring.