The Granit X-Plus 540 is the flagship bicycle U-Lock from ABUS. Ideal for urban settings and high quality bicycles needing strong theft protection, the 540 features a patented 13mm temper hardened steel square parabolic shackle and a double bolting shackle/lock body. Patented ABUS Power Cell technology offers the highest protection against hitting and pulling attacks while the X-Plus Key cylinder offers extremely high protection from picking. The 540 can be keyed alike with other ABUS locks featuring the same X-Plus cylinder - very convenient for multi-lock and multi-bike households. All ABUS locks offer industry leading corrosion resistance.