Question about Bosch Professional GSB 24-2

The speed of the impact drill can be preselected using an adjusting wheel, whereby the required speed depends on the material and the working conditions. The number of blows varies between 0 and 51,000 blows per minute, depending on the idle speed and the selected settings. The drill stop is an essential part of the impact drill and is activated when used to drill into materials such as masonry or stone.