BullDog Series U-Lock - 4.5 x 11, Keyed

The OnGuard BullDog series U-locks offer top - notch protection. They come with X2P Double Bolt lock mechanisms and a sturdy 13mm (0.51”) hardened steel shackle. There's a free 1 - year anti - theft guarantee. With an amazing 4.6 Ton pull strength, it resists drilling and picking. The shackle, made of hardened ultra steel, has a reinforced sleeve on the crossbar and cylinder. Specs include a 11 - inch length, 13mm diameter, no cable, 4.5 - inch shackle width, keyed lock style, and an advertised weight of 3.075 lbs.

Using this OnGuard BullDog U - lock is easy. First, find a secure object like a bike rack to loop the shackle through. Then, insert the key and turn it to lock the shackle in place. When unlocking, just insert the key again and turn it the other way. For safety, always make sure the lock is fully engaged before leaving your bike. Keep the key in a safe place. To maintain it, clean the lock and shackle regularly with a dry cloth. Avoid exposing it to extreme temperatures or harsh chemicals as these can damage the lock mechanism and the steel shackle.