Fitcozi Heavy Duty Quick Link Chain, Threaded Quick Link Rope Connector for Tire, Hammock, Gym, Dod Leash, Fence Gate and DIY AccessoriesQuick Links are easy to use and are the most popular way of repairing a chain. They are two-sided thread links you can slide onto two of the original links and tighten with a wrench.Reusable and easily moveable if necessary. A fast and efficient connection for a temporary or a permanent connection. Usually utilized to add coupling attachments or repair low-carbon steel chains.