Purpose: Bracelet and necklace connecting clasp, through clasp, diy jewelry accessories. Product Size: Round Clasp: Approx. 14 x 10mm / 0.6 x 0.4in, Bar: Approx. 22 x 3mm / 0.9 x 0.1in. Simple and easy to use, just put the rod into the clasp, make the rod level, then it can be tightly fastened.