The KMC Missing Link 11 is an 11 speed chain connector that comes in a six pack and allows quick, easy removal of the chain without tools.
Me and my husband use these missing links on every single bike we own. These are an absolute MUST HAVE, because you can so easily remove the chain from the bike for maintenance or remove the chain for extra cleaning. These links also make new chain installation an absolute breeze. No more having to push in new pins after cutting the chain to length, just install the link and go! Perhaps the biggest "secret" to these missing links is that they are literally a LIFELINE if you break a chain in the middle of nowhere. We always carry a spare missing link wherever we ride - no need to carry a heavy or bulky chain tool! If your chain breaks, all you need to do is take the side with the side links, pop them off (we wedge the broken links into a pedal and they just fall off), then install the missing link and you are good to go.