the securing pin 87 can still be rotated in its bore so that a recess 89 of the securing pin can be rotated to secure or release the axial securing device 86 accordingly when the recess 89 faces the roll shaft 12 or the groove of the roll shaft 12 the clamping ring 81 can be removed because the axial shape fit between the securing pin 87 and the groove is opened while the axial securing device 86 engages when the recess faces away from the roll shaft 12 and therefore the shape fit between roll shaft 12 and securing pin 87 is closed furthermore the clamping ring 81 comprises a clamping element 90 that can apply a clamping force coaxial to the axis 85 of the roll shaft 12 the clamping element 90 comprises a clamping screw 91 by means of which a clamping head 92 can be axially clamped against an adjacent tool 11 in this connection at least two of the clamping elements 90 sit in an angle segment of 180 u00b0 which comprises that inner contact region 83 that lies farthest away from the tool 11 that lies next to the clamping ring 81 in its center in this manner the clamping force applied axially by means of the clamping element 90 leads to a tilting moment that presses the two inner contact regions 83 against the roll 12 the clamping elements 90 are disposed to lie opposite one another in the circumference direction the axial securing device 86 so that the axial securing device 86 is disposed in an angle segment of 180 u00b0 which comprises that inner.