Impact wrenches combine a hammer-like impact with high rotational torque to drive and remove fasteners. They are used in assembly, automotive, maintenance, and construction applications. The impact force is initiated when resistance with the fastener is detected. It is delivered in bursts to minimize the stress that the operator feels when handling the tool. Impact wrenches have a square drive and use impact-rated sockets. Corded impact wrenches plug into an outlet to maintain full power during operation and allow long run times for extended use. Cordless impact wrenches operate in areas without access to wired power, eliminate the tripping hazard of a cord, and run on brand-specific batteries.