●Stainless Steel Magnetic Column Screw Clasps - Fit for 5mm cords. ●Size: about 7.5mm wide, 18mm long, hole:5mm. ●Simple with security. Detailed, magnetic style plated clasp locks securely to keep your jewelry intact. Easy to use it. ●Magnetic Clasps, column with lock. Great for easy open & close security of a lock ●These clasps are designed for round cord strings. These clasps are ideal for light and medium-weight necklaces or bracelet.