Identical to its big brother lock (the gr an it x-plus 540) the U54 mini is a shorter shackle version of abuss flagship bicycle U-lock from Abus. Originally designed to accommodate locking around the reinforced parking meters in San Francisco, this lock is ideal for urban settings and high quality bicycles needing strong theft protection. The U 54 mini 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 U 54 mini 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.