Onguard Pitbull Standard STD U-Lock

No one will mess with the Pitbull™ bike lock! Massive 13mm (1/2") hardened ultra steel shackle provides maximum cut resistance. M-Cylinder™ inner locking mechanism delivers legendary pick-proof protection and its key has over 1 million variations. Dual Steel Bar™ locking mechanism delivers up to 10 tons of pull-strength. Ballistic™ formula plastic is so tough and unbreakable we'd swear it has some kind of Martian technology! Tough vinyl cable cover protects bikes and equipment against scratches. Includes 4 laser-cut keys so no sweat if you lose one; also includes 1 Torch Key™ light key for nighttime use.