A hole saw (also styled holesaw), also known as a hole cutter, is a saw blade of annular (ring) shape, whose annular kerf creates a hole in the workpiece 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. The fact that a hole saw creates ...
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http://en.wikipedia.org/wiki/Hole_saw
A cutting tool used to cut a circular groove into solid material.
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https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/
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