The combination lock is easy to use with a number code. The plastic casing on the lock body and the heavy duty textile hose around the chain prevent paint damage to your bike. 7 mm thick square chain with textile hose to protect against paint damage (Tresor 1385/75 black = 6 mm). The chain is made of specially hardened steel. The number rollers consist of two different components, ensuring that the numbers can be read for a long time. Special contact protection provides greater security against unauthorised unlocking by tampering with the mechanism. An optional lock code can be set