Platinum Plated Alloy Lobster Swivel Clasps For Key Ring, PlatinumSize: about 15.5mm wide, 37mm long, 5mm thick, hole: 7x8mm. â Clever Design: The 360-degree swivel design can effectively prevents the lobster claw clasp from being tangled while the lobster closure is tight enough, not worried that it will open accidentally. â Usage: Fit for making key chains, jewelry making, lanyards, handbags, purse or other DIY bag straps. â Easy to Use: Just depress the knob to open the spring loaded snap gate. When released, the clasp will close automatically. Suggestively to attach a jump ring or split ring for easy connecting pendants, keys, or o other jewelry ornaments on it.