FIG. 1 is a front perspective view of a grinding disc showing a first embodiment of our new design;

FIG. 2 is a rear perspective thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof, the opposite side being a mirror image of the side shown herein;

FIG. 6 is a top view thereof, the opposite side being a mirror image of the side shown herein;

FIG. 7 is a front perspective view of a grinding disc showing a second embodiment of our new design;

FIG. 8 is a rear perspective thereof;

FIG. 9 is a front view thereof;

FIG. 10 is a rear view thereof;

FIG. 11 is a left side view thereof, the opposite side being a mirror image of the side shown herein;

FIG. 12 is a top view thereof, the opposite side being a mirror image of the side shown herein;

FIG. 13 is a front perspective view of a grinding disc showing a third embodiment of our new design;

FIG. 14 is a rear perspective thereof;

FIG. 15 is a front view thereof;

FIG. 16 is a rear view thereof;

FIG. 17 is a left side view thereof, the opposite side being a mirror image of the side shown herein;

FIG. 18 is a top view thereof, the opposite side being a mirror image of the side shown herein;

FIG. 19 is a front perspective view of a grinding disc showing a fourth embodiment of our new design;

FIG. 20 is a rear perspective thereof;

FIG. 21 is a front view thereof;

FIG. 22 is a rear view thereof;

FIG. 23 is a left side view thereof, the opposite side being a mirror image of the side shown herein;

FIG. 24 is a top view thereof; and,

FIG. 25 is a bottom view thereof.