A countersink cutter is a tool used to create a conical-shaped recess in a material, typically metal or wood, to allow for the flush insertion of a screw or bolt. The cutter is designed with a pointed tip that is inserted into a pre-drilled hole and gradually widened to create the countersink.
Countersink cutters can be found in a variety of sizes and shapes to accommodate different screw or bolt sizes and material thicknesses. They can be used with handheld drills or drill presses and are commonly used in woodworking, metalworking, and construction applications. Countersinking can help prevent screws or bolts from sticking out and causing potential hazards or creating an uneven surface.