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Impact wrenches, also known as torque wrenches or air wrenches, are powerful tools that use high torque to loosen or tighten bolts and nuts. They work by using compressed air to deliver a series of rapid blows, or impacts, to the fastener, allowing for the application of significant torque without the need for manual labor. These tools are commonly used in automotive and construction industries, and are essential for heavy-duty tasks such as tire rotation, engine repairs, and building construction. Impact wrenches are available in both cordless and corded models, and come in a variety of sizes to suit different needs and applications.