For Countersink we have terms and definitions in 3 topics. The topics are Furniture, Wood and Woodworking.

Conical boring in wood which receives a screw head so that the surface of the screw is lower than the wood surface.
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A shallow, conical hole in a workpiece that matches the shape of a flathead screwhead. When used without a counterbore, it positions the head flush with the surrounding surface, shown above.
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A tool that allows you to drill a hole so that the head of a screw will sit flush with the face of a board.
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