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. It\'s 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 giving excellent protection against cutting and torsion attacks in a simple yet innovative designThe Ultra 410 uses a very easy to mount, rattle free SH bracket and comes in a full range of mini and standard sizes