FIG. 1 is a perspective view of the ornamental design a milling bit;
FIG. 2 is a first side elevation view thereof;
FIG. 3 is a second side elevation thereof;
FIG. 4 is a third side elevation thereof;
FIG. 5 is a top view thereof; and,
FIG. 6 is a bottom view thereof.
The broken lines show portions of a milling bit that form no part of the claimed design.
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