• Thanks for the review. I have a BBB multitool with a chain breaker that uses the tool's 5mm Allen key to drive it. On the occasions I've had to break a chain in anger it's done the job fine, but I wouldn't want to try rejoining a chain with it (but then I would only ever try that in extremis anyhow - I just carry a couple of quick links, and would only try that if I ran out).

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