1.50mm Sterling Silver Solid Cable Necklace Extender or Safety Chain, 2.25" Extender Chain with Round Spring Ring Clasp; Inside Dimension of Clasp is 1.00 Millimeters Extender-Safety Chain Measures 2.25 Inches Long; 1.50 Millimeters Wide or .059 Inches Also Used as a Safety Chain for Watches, Bracelets and Necklaces Chain is Crafted in Sterling Silver