Shimano HG-X and HG 10v CN7900 / 7801 chain connector pinAssemble and disassemble your chain easily and quickly, fix breakdowns en route quickly thanks to the chain connector pin. Shimano HG-X and HG 10v CN7900 / 7801 chain connector pinVery useful accessory to be able to remove the chain and put it without using chain-breakers, to be able to repair it in case of failure, shortening it and inserting another spare pin, or to be able to wash it thoroughly separately from the bike.