Really useful for spares & repairs to a necklace or bracelet this is a great 9ct rose gold secure bolt ring clasp from the late Victorian period. The gold is marked to the side. Good secure clasp with a good spring. Diameter 0.9 cm or 0.3 inches. Total length 1.4 cm or 0.5 inches. Weight 0.6 grams or 0.375 penny weight.