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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. Chain wrenches and tongs turn smooth cylindrical objects, such as pipe. Strap wrenches fit around large or irregular shapes to grip and turn parts. Electric impact wrenches offer high torque output for heavy-duty fastening applications in automotive repair, heavy equipment maintenance, and product assembly. Spanner wrenches have a pin that locks into a hole to prevent the wrench from slipping when turned. Striking and slugging wrenches can be hit with a hammer to apply additional force on stuck or frozen parts.