This is a fancy sterling silver slider dangle bail.
It measures 17 mm. in length (about 5/8"), 12 mm. in width (about 1/2") and weighs 2.04 grams.
Inside of bail measures 8.5 mm. x 6 mm.
Bail will slide over an Omega chain.
Add your dangle pendant to the open ring.
Made in the USA.