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Wrenches tighten and loosen bolts, nuts, and other fasteners and are used in metalworking, plumbing, and electrical applications. Adjustable wrenches have jaws that can be opened and closed to ensure a tight grip on fastener heads. Box end wrenches have thin sides and a closed end that encircles fasteners to help turn nuts that are hard to reach. Ratcheting box end wrench sets have a gear mechanism that allows the wrench to rotate freely in one direction without removing the wrench head from the fastener and repositioning the wrench. Strap wrenches fit around large or irregular shapes to grip and turn parts. Chain wrenches use a length of chain to hold smooth, circular objects. Chain tongs are a length of chain with an extra-long handle that provides leverage for turning heavy objects.