FIG. 1 is a perspective view of a knife blade, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a perspective view thereof with several enlarged portions;

FIG. 9 is an enlarged front view thereof with an enlarged portion;

FIG. 10 is an enlarged rear view thereof;

FIG. 11 is a bottom view thereof with an enlarged portion; and,

FIG. 12 is another perspective view of the knife blade, shown attached to the handle in broken lines for completeness of illustration.

The broken line showing the handle forms no part of the claimed design.