Sterling Silver Crimp End with a loop for attachment - use to connect to the clasp of your choice. The interior hole allows for use with thicker cords. The opening is rated at 2.5mm but can sometime be as large as 2.6mm. Overall size is 10mm long, 4mm diameter. These are nicely made crimp ends - heavy enough to hold well, but light enough to crimp closed with crimping or needle nosed plier. Sold individually.