In construction, a pilot hole is a small hole drilled into a piece of construction material. Its purpose may be: 1. * to guide a larger drill to the appropriate location and ease the job of the larger drill 2. * allow for the insertion of another hole-making tool, such as a knockout punch, that will produce the final-sized hole, or 3. * locate, guide, and provide clearance for a self-threading screw in wood or plastic to prevent damaging the material or breaking the screw.
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