This is a .925 silver clasp. Brand new (was wrong size for my application). From the manufacturer: * Size(W x H): 12x9mm / 0.47x0.35 inch; Clasp Diameter: 2mm / 0.08 inch; * Material: 925 Sterling Silver * You can use it to your necklace ,bracelet ,and other jewelry findings.The classic heart snap hook with spring-close gate for extra security. * Molded and casted,no seams in the middle.