20 CleverDelights Magnetic Jewelry Clasps - Tube Style - Silver Color - Necklace Magnet Clasp Converter Beautiful silver color - Tube style Total length: 5/8" (15mm); Tube length: 3/8" (10mm); Tube diameter: 3/16" (5mm); Connector hole: 1/16" (2mm) 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