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Centered Pilot HolesThese make it effortless to make the pilot hole centered so that the hinges (or board) are in the spot needed so the screws are set evenly and centered.
Handy for those odd jobsNot something you'll use every day, but very handy for the times you need to mark a center through a hole in a thick part. Store them in a ziplock, as the centering cones are held on only by friction of the spring and can come off.