1PC Snap Necklace Fit Snap Buttons Magnetic Snake Black 50cm DIY-Fashion Jewelry,create your style in a snap Material:Alloy + PU Approx:50cm x2.3cm;Hole size: 6mm The Size Of Magnet:12mm Dia. The suitable button fastener size:5.5mm( 2/8") Including one black velvet bag,it is perfect as a gift