We tested the chain end link by cutting steel with a 10 cord saw. Thanks to the rectangular connection, it's even easier to lay on a flat surface and get a nice, thorough cut. I was able to cut the chain in less than 5 minutes. I originally bought a chain with the lock shown in the photo, the key broke off in this lock so I had to cut the chain to free the bike. Quite simply, it's a strict deterrent.
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