PARACORD PLANET Single Round Ball Cord Lock Draw String Toggle Stopper in Choose from 5-100 Pack Sizes Round Cord lock with a 7/8 diameter  Length: 22 mm, Width: 17.5 mm, & Thickness: 13.5 mm Hole size: Approximately 4 mm (Fits one strand of #550 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 Great add-on for your luggage, clothing, backpacks, tents, paracord projects, and much more!!