Guard Security 55224 U Shackle Bicycle lock. Features a long hardened-steel "U" shackle that resists attacks by hand tools. Reinforced collar over keyway for increased protection. U-shaped design makes it easy to attach and secure your bike on railings, bike racks, posts and other inanimate objects that cannot be moved or carried off with your bike. Includes a handy carrier bracket for easy transport and storage convenience. Vinyl coated for weather and scratch resistance. Each Guard Security padlock is individually tested at the factory to ensure smooth performance before packaging. Lifetime warranty.HBC Home & Hardware Products - driven to perfection producing quality products for everyday living