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A reader says this is the smallest open-end wrench in the world, with 0.005 in. across the flats on one end and 0.010 in. across the other. The human hair next to the wrench gives a comparative size.

Add Yahoo as a preferred source to see more of our stories on Google. Get to know various kinds of wrenches that every homeowner can find a place for in their toolbox. When it comes to tools, there ...

The wrench has long been the definitive symbol of automotive repair, decorating shop signs the world over. It makes sense; wrenches have found their way into mechanics' hands ever since the beginning.