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We're talking about this type of pipe cutter, right?

https://www.screwfix.com/p/irwin-record-handicutter-15-45mm-...

They're much cheaper than an angle grinder, and fit in your pocket. I've used one to cut through the barrel of a d-lock with ease. I don't buy d-locks with cylindrical barrels any more. I learned this trick when thieves stole my friends bike this way :-(

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Yes, this is the tool I was talking about. For a d-lock (aka u-lock), you'd need a quite large lock with a lot of space between the crossbar and the bike for a pipe cutter to work. The risk does exist nonetheless, which I wasn't aware of before. Thanks for pointing that out!

I saw these the other day: https://www.amazon.co.uk/Ryobi-18-Volt-Cordless-Bolt-Cutters...

I'm sure if you were a regular bike thief they could pay for themselves in no time.

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