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As one of an auto mechanic's must-have tools, an impact wrench delivers high torque with limited physical effort because of its compressed air, electric, or hydraulic power source.

Used to quickly and easily tighten or loosen nuts and bolts, an impact wrench is also common in a product assembly line or in major construction projects. Additionally, impact wrenches come in many sizes and styles depending upon the intended use. Save some elbow grease for other projects and use an impact wrench where you can.