Iron Swivel Snap Hooks Clasps, Jewelry Findings, PlatinumSize: about 13.5mm wide, 37mm long, hole: 10x5mm. â Clever Design: The 360-degree swivel design can effectively prevents the snap swivel clasp from being tangled. Itâs adopted flexible spring, making it easily to open and close securely. â Usage: Fit for making key chains, jewelry making, lanyards, handbags, purse or other DIY bag straps. â Easy to Use: Just depres the spring loaded snap gate and then. Suggestively to attaching a split ring for easy connecting pendants, keys, or o other jewelry ornaments on it.