The Ultimate 420 U-shaped Abus lock is recommended for tying high-end bicycles in average theft risk areas. The manufacturer gives it a medium safety level, 12 out of 15. The longer the shackle is, the easier it is to secure the bike to a fixed object.The shackle, the case, as well as other parts are made from special hardened steel for maximum safety. To protect other elements of the bike, we recommend 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?