This is the kmc 18 universal joining chain link this is a pack of two universal joining links for 18 x 12 chains kmc offers the finest range of bike chains in the world within the space of just 4 years kmc has succeeded in producing not only a chain for every user but also a chain of unequalled quality in every riding discipline since its inception some 30 years ago kmc has become one of the leading bike chain manufacturer in the world