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A Hole saw also known as a hole cutter is a saw blade of annular (ring) shape, whose annular kerf creates a hole in the work piece without having to cut up the core material. It is used in a drill. Hole saws typically have a pilot drill bit at their center to keep the saw teeth from walking. It preferable to twist drills or spade drills for relatively large holes (especially those larger than 25 mm). The same hole can be made faster and using less power.