The ABUS Granit X Plus 540 U-Lock is recommended for securing high quality bicycles in high theft risk zones or for long periods. The shackle, the case, as well as other parts are made from special hardened steel for maximum safety. The longer the shackle is, the easier it is to secure the bike to a fixed object.It offers very good protection, in part thanks to the ABUS Power Cell technology, and the manufacturer gives it the highest level of security, 15 out of 15. The lock comes with the ABUS Code Card for additional or replacement keys. We recommend, to protect other parts of the bicycle, to use additional tools such as auxiliary security chains, U-Locks or other types of cables. MORE INFORMATION: How to choose the best lock to protect your bike?