High speed drill bit for mortar

The ornamental design for a high speed drill bit for mortar, as shown and described.

FIG. 1 is a side elevational view showing my new design for a high speed drill bit for mortar;

FIG. 2 is an end view taken in the direction of the cutting end; and,

FIG. 3 is an opposite end view taken in the direction of the shank end.

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