Plastic single hole cord lock is for locking cord for conveneint use. With spring loaded design. They are spring loaded and guaranteed to keep your cord tight and secure. Heavy Duty High Quality POM Plastic, Durable and Lightweight. Widely used for lanyard, luggage, clothing, backpack, sportwear, shoelace, tent and more. Double hole cord lock: each toggle stopper measures 22 mm/ 0.866 inch in length; Each hole diameter: approx. 6 mm/ 0.236 inch, fit most types of drawstrings and cords. Quantity: 25 pieces, enough for craft usage, can meet your needs for DIY; Note: small parts, not suitable for children under 3 years old. A spring loaded barrel cord lock closes bags, hoods, hats, etc. fairly securely and without tying.