Shimano HG 9v CN7700 chain connector pinAssemble and disassemble your chain easily and quickly, fix breakdowns en route quickly thanks to the chain connector pin. Shimano HG 9v CN7700 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.