We claim the ornamental design for drill bit, as shown and described.
FIG. 1 shows a drill bit in a front view.
FIG. 2 shows a side view from the left side of the drill bit in FIG. 1.
FIG. 3 shows a side view from the right side of the drill bit in FIG. 1.
FIG. 4 shows the drill bit in a rear view of the drill bit in FIG. 1.
FIG. 5 shows a bottom view of the drill bit for percussive drilling.
FIG. 6 shows a top view from the upper side of the drill bit in FIG. 1; and,
FIG. 7 shows a perspective front view of the drill bit for percussive drilling.
The short equidistant broken lines in the drawings depict unclaimed environmental subject matter and the dash, dot, dot, dash broken lines depict the boundary of the claimed design and form no part thereof.