Wrenches with a double head or end, such as the Teng Tools 19mm x 22mm Metric Double Head/End Open Flare Nut Wrench and Teng 621213 Double Open Ended Spanner, offer versatility and convenience.

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These wrenches come in sets of several sizes, and each wrench is made to fit a nut of a specific size, whichever end you use. See the sidebar "Using a combination wrench like a pro" for details ...

Striking wrenches may have either an open end or a box end (with both metric and SAE options available). They have a ...

These wrenches have an open, U-shaped end and a closed “box” end, ... Each wrench size fits into the female receptacle of a bolt or screw, ...

The metric set sizes range from 6 to 19 mm, while SAE sizing goes from 1/4” to 7/8” – both feature a thickness of 2 mm on the lower end, going up to 4 mm in the largest sizes.

The wrenches have a uniquely shaped head, with a spring-loaded “under-jaw” that acts as a ratchet. Most open-end wrenches need as much as 60 degrees of swing to work, but the Alden wrench only needs ...

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.

Jaw design can influence the strength of open-end wrenches. “Every so often some wrench manufacturer comes out with a V-shape in the back of the jaws on their open-end wrenches,” says Tom ...

The granddaddy of modern wrenches, an open-ended wrench may have been in the tool collections of some ancient ancestors, who ...

The granddaddy of modern wrenches, an open-ended wrench may have been in the tool collections of some ancient ancestors, who likely made it out of bone. Steel versions came into their own during ...