Cordless impact wrenches are battery-powered tools used to drive and remove fasteners. Battery-powered tools don't need access to a wired power source and don't have power cords or air supply hoses that can cause tripping hazards. Impact wrenches have a square drive and use impact-rated sockets. They combine a hammer-like impact with high rotational torque to drive and remove fasteners. The impact force is initiated when resistance with the fastener is detected. The impact is delivered in bursts to minimize the stress that the operator feels when handling the tool.