An electric power tool of the type which has an inserted tool bit (8), which can be operated with a rotary and a hammer action, and comprises a hammer which can be activated by axial displacement of the tool bit (8) by engagement with the work piece, also comprises a manually operable adjustment handle which can be rotated about an adjustment axis (59) between a first position in which a stop element (53) permits the axial displacement for the activation of the hammer, and a second position in which the stop element (53) blocks the axial displacement. The stop element (53) is connected with cam surface (61, 62) which is coupled with an adjustment element (41) movement of which switches between high and low speeds of the tool. The cam surface has an arc-shaped portion (61) circular about the adjustment axis (59). Connected to one end of the arc-shaped portion (61) of the cam surface is a curved second portion (62), the distance of which from the adjustment axis (59) changes continuously. Through the engagement of the additional section (62) with the adjustment element (41), the adjustment element (41) is displaced on movement of the adjustment handle so to switch to another speed setting.