Sterling Silver Crimp End with an integral hook. 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 13mm long, 4mm diameter. Hook matches up nicely with the crimp ends that have a loop - Part# SSF-CE25. 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.