The ornamental design for a cuttinginsert, as shown and described.
FIG. 1 is a front view of a cutting insert of the present design;
FIG. 2 is a rear view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a first perspective view thereof;
FIG. 8 is a second perspective view thereof; and,
FIG. 9 is a referential perspective view showing the state in use of the cutting insert attached to the holder by fixing member, for cutting a work piece.
The broken lines in the referential perspective view depict unclaimed environmental subject matter.