Cordless Impact Wrench

An impact wrench is a socket wrench power tool designed to deliver high torque output with minimal exertion by the user, by storing energy in a rotating mass, then delivering it suddenly to the output shaft. It was invented by Robert H. Pott of Evansville, Indiana.Impact wrenches are found in the tool chests of mechanics everywhere. They're commonly used for loosening lug nuts from cars and trucks, but they can also be used in any high-torque situation.