PARACORD PLANET Double Barrel Cord Lock Draw String Toggle Stopper in Choose from 5, 10, 20 Pack Sizes Double Barrel Cord lock with a 5/8 diameter  Height: 16 mm, Width: 17 mm Hole size: Approximately 3 mm (Great for 1/8 diameter Paracord) Cord lock is made of plastic with an internal spring that is spring loaded (Consists of barrel, toggle, and spring) Release the tension of the lock to slide up and down your cord or drawn string to its desired position Perfect for lanyards and a great add-on for your luggage, clothing, backpacks, tents, paracord projects, and much more!!