Approximately 13x4x6mm gunmetal TierraCast® nouveau necklace bails, 1.3mm inner diameter loop. Necklace bails make adding a jewelry focal to your cord easy. TierraCast uses "Britannia" casting alloy for cast pewter components. Fits up to 2.8mm cord and chain. This style does not open – slide over necklace and use a jump ring to attach pendant. Measurements include loops. TierraCast Safety Compliance.