# Operating Principle

The tool holder (1) (with the application tool) is driven by an electric motor via a gear and impact mechanism.

The working procedure is divided into two phases:
Screwing in and tightening (impact mechanism in action).

The impact mechanism is activated as soon as the screwed connection runs tight and load is therefore put on the motor. The impact mechanism then converts the power of the motor to steady rotary impacts. When loosening screws or nuts, the process is reversed.