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I've bought a saddle bag with a set of bike tools; stuff like alan keys, puncture repair kits, spanners etc. There's this one tool (well two but they screw together) that I have trouble recognising.

I know for sure it's not part of the installation of the saddle bag. It also didn't come with any instructions.

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I didn't intend for the photographs to match the colour scheme of the site :o – Ambo100 Nov 3 '11 at 16:53

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up vote 21 down vote accepted

Its a Chain tool, the long bit should screw into the back (bottom side in the pic) of the other bit to provide a handle. You can then put an hex key into the twisty bit at the right hand end.

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and a nice chain tool at that. – Moab Nov 15 '11 at 1:28

Yep, a chain tool, or "chain breaker". They come in a wide variety of shapes and sizes.

You should note that a given width chain needs a specific chain tool, so the one you have may not work well with your chain.

And never just get a chain tool and trust it to work (and be workable by you) without trying it first on some scrap chain of the appropriate size. In addition to being the wrong size or simply too "cute" to work (often the case with "multi-tool" versions), the punch pin can be worn/cracked to the point that it no longer cleanly presses the chain pin.

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Ironically I've found all my multi-tool ones worked better than the one I have lying about in my workshop! I did have one break after years of use though. – Colin Newell Nov 3 '11 at 9:19

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