These spring cord lock fasteners are made of plastic with single hole and spring loaded design which are easy to install and use, provide with a firm grip, just slide the drawstring through the hole and done. Helping to stop drawstrings from slipping. Size: 27mmx14mmx9mm/1.06inchx0.55inchx0.35inch. Hole size: 7x4mm/0.28x0.16inch. Cord lock stopper fasteners are great for shoelace, drawstring, pants, string bags, backpack, shorts, hats, jackets, sweatpants, outdoor coats, luggage and so on, keep your cord, drawstring, string or lanyards secure. Cord locks can work perfectly to repair a backpack toggle and replace some old cord locks on pant, jacket or hats. Perfect for sweat pants that always get knotted or tied too tight or shoelaces constantly coming loose, help to keep tightening drawstring pants and shoelaces. 20pcs black color elastic cord lock adjuster, suitable for craft and DIY project. These spring cord lock fasteners are made of plastic with single hole and spring loaded design which are easy to install and use, provide with a firm grip, just slide the drawstring through the hole and done. Helping to stop drawstrings from slipping.