At both end it has strong Bolt ring clasp and there is a choice of 5 mm or 6 mm 9ct gold Bolt rings. This safety chain/necklace extender features
Ross-Simons Italian 14kt Yellow Gold Magnetic Clasp Converter with Safety Chain : Clothing, Shoes & Jewelry
925 Sterling Silver Hamsa Hand Filigree Pendant Necklace & Curb Chain P064
Jewellery Safety Chains, Gold Safety Chains
9ct 9K Yellow Gold Two Clasp Extender Safety Chain, 0.5 1 1.5 2 3 Heavy Weight Strong Chain Trigger Parrot Clasp Connector, Solid Gold
HEAVY & STRONG 925 Sterling Silver Necklace Extender Chain With Bolt Clasp. This heavy safety chain/necklace extender features strong 4.2mm wide
HEAVY 925 Sterling Silver Necklace Necklet Extender Safety Chain 1 Bolt Clasp
HEAVY 925 Sterling Silver Necklace Necklet Extender Safety Chain 1
Spring Ring Clasp Extender 14k Gold
9CT YELLOW GOLD Infinity Pendant 16 Inch Belcher Chain Necklace Love Forever £92.00 - PicClick UK
Lulau 14K Solid Gold Necklace Extender Real 14K Bracelet Extender 2 3 4 inch Durable Adjustable Chain Gold Anklets Extension for Women 2 3 4 (14k
9 CT GOLD Necklace necklet extender safety chain two 6 mm Bolt Rings Clasps sf3 £29.99 - PicClick UK