Simply put, this is the world's best U-Lock. The Granit Extreme 59 comes from Abuse's motorcycle lock line-up and does cross-over duty with bicycles for those looking for the best possible protection and who don't mind carrying a heavier lock for the very maximum in protection. Made of the highest quality temper hardened steel, the patented 16mm square parabolic shackle offers the highest level of protection (20 out of 20 for motorcycle) available. The patented X-Plus Key cylinder offers extremely high protection from picking and it can be keyed alike with other ABUS locks featuring the same X-Plus cylinder - very convenient for multi-lock and multi-bike households