With OnGuard's Doberman Combo lock, all you need is your bike, the lock, and a number you can remember. This combination lock uses four numbers and can be reset any time. It's made from a strong steel cable covered with tough vinyl to protect both itself and your bike. The Doberman Combo is also self-coiling for easy transport.
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bought this lock thinking it was an ok lock for the city i live in of around 300 000 ppl but bike waqs stolen, i seen the video and the guy had the bike stolen within 15 seconds of walking up to the bike he was able to figure out the combination