1ZINC ALLOY MATERIAL: Lanyard string cord toggles are made of zinc alloy, not easy to break and rust, can be used for longer time. 2SPRING LOADED DESIGN: Shoe lace toggles stopper features a spring loaded design that provides great flexibility for quick use release, keeping your rope tight and secure. 3EASY TO USE: Simply thread the pull rope through the hole and tighten to secure. When you need to adjust the length, simply release the rope lock. 4APPLICATION: Cord lock end toggle is suitable for lanyards, drawstrings, luggage, clothing, backpacks, sportswear, shoelaces, laundry bags, jackets, hats, organizers and other uses. 5CONVENIENT AND PRACTICAL: With its simple and user friendly design, the metal spring cord lock has become a must have tool for daily life, meeting your diverse needs. 30 x Spring Cord Lock