With the ABUS chain lock CityChain 1010, you are on the safe side when it comes to theft protection for your favorite bicycle. 9 mm thick hexagonal chain with textile cover to protect against paint damage. The chain, the housing, and load-bearing parts of the locking mechanism are made of specially hardened steel. ABUS Plus cylinder for high protection against tampering, e.g. picking. Automatic cover for the keyhole against dirt and corrosion.