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The ornamental design for a drill bit blade, as shown and described.
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FIG. 1 is a perspective illustration of the drill bit blade of the present invention;
FIG. 2 is a front elevation view of the drill bit blade of FIG. 1, the rear elevation view being mirror thereto;
FIG. 3 is a left end elevation view of the drill bit blade of FIG. 1, the right end elevation being mirror thereto;
FIG. 4 is a top plan view of the drill bit blade of FIG. 1; and,
FIG. 5 is a bottom plan view of the drill bit blade of FIG. 1.
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