Featuring a simple strong and aggressive design the ultra 410 is the ideal entry level u lock and rounds out the super ultimate and ultimate line up in it39s simple design conceals a number of high tech advancements in securitythe 12mm double bolting temper hardened steel shackle extends all the way through the lock body providing excellent protection against cutting and torsion attacks in a simple yet innovative designthe patent pending double layer wafter key cylinder features an easy to