This interesting finding reminds me of nothing quite so much as an attachment on a horse's harness. It folds over and pushes onto a pin - so you can use this for a pendant where you want to swap the pendant on and off, or earrings, same idea, or even as a clasp, I think, hooking onto a ring. Quite a few uses - very interesting. Inside loop is 3.5 x 5 mm. Lead, nickel and cadmium free.
Lead-free. Nickel-free. Made in Israel. 4.5mm x 19mm By the each.