Nickel-plated malleable iron. 3-7/8" overall with 3/4" round eye.
Made in China
These are great clips for just about any use! On a chain or rope they make a wonderful double-ended lead for a lot cheaper than buying one. The snaps which were shipped to me had square eyes, not round ones (which I would have preferred). The price is much more reasonable than from anywhere else I have seen.