10 is shown in the unused state in fig4 a and b comminuting tool 10 has a plate shaped design with a bearing area 11 in which a bored hole 12 for the pendular suspension of comminuting tool 10 in a rotor is introduced comminution area 13 which is active during comminution and whose two opposite plane parallel sides 34 end with an active edge 14 joins bearing area 11 outwardly because of the different thicknesses in the transitional area a one sided projection of bearing area 11 arises over comminution area 13 which results in the formation of a reference surface 15 the perpendicular distance a 0 of active edge 14 to reference surface 15 defines the distance direction and again represents the target dimension characteristic for an unused comminuting tool 10 the state of comminuting tool 10 after its use in a comminuting device is again shown in fig5 a and b the dotted line 16 enabling a comparison with the original state fig5 a and b show that the height of comminution area 13 has been reduced due to wear and therefore the position of the active edge 14 u2032 is moved closer to bearing area 11 the wear that is present results in turn from the difference between the original distance a 0 and the distance a 1 fig6 clarifies the process of wear determination here as well.