hand tool

what are they used for ?

wrenches are use for tightening or loosening bolts, nuts or anything that needs turning. Solymon Merrick patented the first wrench in 1835.The wrench is pulled at a right angle to the axes of the lever-action and the bolt or nut. some wrenches have mouths that can be tightened to better fit various objects that need turning.

what are they made out of ?

http://www.About.com/inventersThe best wrenches are made of alloys like chrome or vanadium, while less expensive tools are made from molybdenum steel or are simply stamped from sheet metal. The stamped wrenches are bulkier (more material is needed for strength), and are quite useful for occasional light duty. For frequent use, however, and for virtually any automobile applications, more expensive tools will prove the better investment.

Facts About Wrenchs

  • http://www.Tenrandomfacts.com A combination wrench combines open and box wrench.
  • wrenches can cause injury, particularly by slipping, if used incorrectly such as by using on a incorrect angle or a different nut size.
  • Pipe wrenches should only be used on round or rounded items.