CleverDelights 50 Magnetic Jewelry Clasps - Spiral Style + Lobster Clasp - Silver Color - Clasp Converter Beautiful silver color - Spiral style with jump ring and lobster clasp pre-attached Total length: 1.25" (31mm); Tube diameter: 3/16" (5mm); Jump ring hole: 5/32" (4mm) Easily fasten your necklace chains with these magnetic clasps Perfect for converting pesky necklace clasps into a simple magnetic clasp or for those suffering from arthritis Top-quality CleverDelights-brand clasps -- Ships from a USA warehouse