KMC CHAIN-MISSINGLINK 11SP CHROME 2PC
Quick link for 11-speed chains
These links are made to replace broken links in chains, as well as joining new chains. The 2 plates hook into each other from the opposite side. You then pull them into a locking place with either a pedal action, or some special chain pliers (available from Birzman). They come as a pack of 2 complete sets.