A cordless impact wrench is a powerful handheld tool used for tightening and loosening nuts and bolts quickly and with high torque. It is powered by a rechargeable battery, making it portable and convenient for use in automotive work, construction, and mechanical repairs. The tool consists of a motor, an impact mechanism (hammer and anvil system), a square drive for attaching sockets, a trigger switch, and speed/torque control settings.

In operation, the correct socket is attached to the square drive and fitted onto the nut or bolt. When the trigger is pressed, the motor rotates the mechanism, and the internal hammer strikes the anvil repeatedly, producing strong bursts of rotational force (impact). This action allows the tool to loosen tight or rusted fasteners or tighten them securely with minimal effort from the user. The speed and torque can be controlled using the trigger or settings on the tool. After use, the trigger is released, and the tool stops, ready for the next task.