Drill bit countersinks can drill and countersink a hole in one step for maximum productivity. Drill bit countersinks produce a chamfered hole with a tapered opening that allows screws to install flush with the surface of the workpiece for a finished look. This helps prevent the workpiece material from swelling when a screw is installed in the hole and tightened down in woodworking and metalworking applications. They can also be used to debur holes for a smooth finish.
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