A power wrench is type of wrench that is powered by other means than human force. A typical power source is compressed air. There are two main types of power wrenches: impact wrenches and air ratchet wrenches or pneumatic ratchet wrenches. ==Air ratchet wrench== An air ratchet wrench is very similar to hand powered ratchet wrenches in that it has ...
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http://en.wikipedia.org/wiki/Power_wrench
(from the article `wrench`) Power or impact wrenches are used for tightening or loosening nuts quickly. They are essentially small hand-held electric or pneumatic motors that ...
Found on
http://www.britannica.com/eb/a-z/p/103
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