Bicycle chain lock. Features: The flexibility provided by chain locks is ideal for cyclists who often need to lock their bike up in different locations. The clear advantage with its 5 mm square chain made from specially hardened steel, is its flexibility. It offers numerous options for locking your bike securely to various objects. Ideal objects include sturdy bike stands or lampposts, as long as the bike does not hinder anyone else when left there. The chain length is 75 cm and the thickness is 5 mm. Weight: 510 g. Colour: Black.