Spring cord locks dimension: each cord lock size (LxW) is 19x15 mm / 0.7x0.6 inch, the hole diameter is approx. 5 mm, normal size fits common uses.Firm grip cord lock fits a variety of different drawstrings and types of wires. They Can be used on everything from shoelaces, pack drawstrings, pants closures, products and a variety of outdoor and gym accessories. Widely used for lanyard, luggage, clothing, shoe bags, sportswear, hats and more.Simply squeeze together and the cord lock can move freely up and down. When released, tension is engaged and the cord lock stays in place. These are great for use on sweat pants or hoodies to keep from losing the drawstring and to tighten the cord as well. Can also be used to replace lost or missing barrel locks.Each package includes a total of 40 round sliding chord locks. Enough quantity for your daily using and replacements. Round toggle stoppers with spring loaded design, can keep a firm grip on whatever the use is for, easy to install. They are perfect for shock cord, elastic cord, finer cords, pull cords, draw cords, wet cords, backpacks, tends, jacket, sweater, reusable mesh bags making and other uses.The sliding cord fastener locks in black color are made of plastic, sturdy and solid to use. The dark color will match with all your clothing with ease.