OnGuard Bulldog Standard U Lock. The OnGuard Bulldog Standard U Lock provides superb peace of mind when it comes to securing your bike. This full sized U lock features all the protection features that makes OnGuard a stalwart bike security such as the Z Key cylinder with its pick , pull , and drill resistant design plus an ultra hardened steel shackle that's 13mm in diameter. Five keys are included, including one with a micro light for ease of use when the sun goes down.
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