The Nite Ize KnotBone Cord Lock is a small plastic cord lock from the KnotBone range, used to secure and adjust cord without tying knots. Thread a cord through it and use the wrap-and-lock motion typical of the KnotBone range to hold the cord at the length you want, then release it just as easily when you need to adjust. Cord locks like this are useful on tent and tarp lines, stuff sacks, bag drawstrings, jacket hems and gear lashings. The #3 size is the smallest of the KnotBone sizes and suits thin cord, and this pack contains four cord locks. This item has been discontinued by Nite Ize and we could not find its official product page, so exact dimensions and the supported cord diameter are not listed here.