I claim the ornamental design for a wood boring bit, as shown and described.
FIG. 1 is a perspective view of a wood boring bit embodying the invention.
FIG. 2 is a front view of the wood boring bit shown in FIG. 1, the rear view being substantially the same as the front view.
FIG. 3 is a right side view of the wood boring bit shown in FIG. 1, the left side view being substantially the same as the right side view.
FIG. 4 is a top view of the wood boring bit shown in FIG. 1; and,
FIG. 5 is a bottom view of the wood boring bit shown in FIG. 1.
The elements shown in broken lines are included for the purpose of illustrating environment and form no part of the claimed design. The portions shown in broken lines having unequal length segments illustrate the boundary of the claimed design and form no part of the claimed design.