The Countersink/Counterbore bits are used to make screw fasteners flush with the surface of the work and are machined from high carbon steel. When counterboring and plugging is not desired, you are also able to produce a perfect countersink by setting the stop collar just behind the cutting flutes to control the depth of the bore. These tools run around $35.00 for a set of 15, depending on the manufacturer.

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