sections 27 on the other hand each have on their back side an offset 18 increasing from the outside 24 in the direction toward the inside 23 as a result of which the end sections 27 each have a wedge shaped cross section with a wedge surface 28 which as will be explained later in further detail serve for clamping the tool units 22 to the housing 1 the wedge surface 28 in this process can be lined with a replaceable fill plate 19 so that different thicknesses of the fill plate 19 can modify the wedge height and thus the relative radial position of the tool unit 22 relative to the rotor tools 16 the front side 25 of the tool unit 22 is machined in the area between the end sections 27 to form a one piece receptacle for the stator tools 20 the receptacle comprises a first support surface 29 extending lengthwise in a tangential plane and a second support surface 30 traveling at a right angle to this lying in an axial plane in addition a strip shaped extension 31 is formed along the longitudinal edge of the holder 21 formed by the outer side 24 and the front side 25 in the recess formed in this way the stator tools 20 are placed and clamped with screws 32 against the first support surface 29 optionally with insertion of adjusting plates between the first support surface 29 and stator tools 20 to adjust the radial projection of the stator tools 20 in this process the active edges of the stator tools 20 project over the inside 23 and in the operating position form the previously mentioned working gap with the rotor tools 16 additional clamping of the stator.