the u201c impact drilling u201d mode can be engaged and disengaged setting ring 12 has a two component design and is composed of a manually holdable outer ring 121 and an inner ring 122 inner ring 122 is rotatably supported on guide sleeve 11 and is rotatably connected with outer ring 121 rotatable threaded ring 13 bears against the inner surface of inner ring 122 and can be rotated using the setting ring not shown here for the u201c drill u201d and u201c screw u201d modes inner ring 122 has two control curves 14 on its front side only control curve 14 is shown in fig1 two control cams which are not shown in fig1 are positioned on both control curves 14 such that when setting ring 12 is rotated into its u201c impact drilling u201d position the control cams each run up onto a blocking element 15 both blocking elements 15 are guided on guide sleeve 11 in an axially displaceable manner and are pressed via compression springs 16 against control curve 14 of inner ring 122 and threaded ring 13 when the control cams run onto blocking elements 15 the latter are pushed back against the force of compression spring 16 and block the safety clutch in this position in this rotational position of setting ring 12 an actuating unit u2014 which is not shown here u2014 switches on.