We claim the ornamental design for a set of panels attachable to a handle of a firearm, as shown and described.
FIG. 1 is a perspective view of a set of panels attachable to a handle of a firearm according to our design;
FIG. 2 is a perspective view thereof;
FIG. 3 is a side view hereof;
FIG. 4 is a side view hereof;
FIG. 5 is a front view thereof;
FIG. 6 is a rear view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a top view thereof;
FIG. 9 is a side view of a panel attached to a frame of a firearm; and,
FIG. 10 is a side view of a panel attached to a frame of a firearm.
The broken lines showing portions of the set of panels attachable to a handle of a firearm are included to illustrate portions of the article; the broken lines showing a firearm in FIGS. 9 and 10 are included to illustrate environmental structure; all broken lines form no part of the claimed design.