The Bluebird Chain uses a standard KMC 510-HX link and plate configuration and includes a KMC Pintle half-link that's pre-installed at the factory. The idea of the pre-installed half link is simple. If you need the half link, than shorten the chain at the other end. If you don't, than shorten at the half link end. The Bluebird is available now in black, gold and silver.