Brass Sew on Prong Settings, Finding, Filigree Open Back Claw Settings for Pointed Back Rhinestone. Takes Oval stone 13x18mm. Size: about 15mm wide, 20mm long, 6mm thick, tray: 18x13mm. Fold over prongs to secure stone. (Stone not included.) Lead-free. Nickel-free. 15mm x 20mm By the pack of...