Product Description of the Norton Tungsten Carbide Burr Cone Shape, 1/PackA cone-shaped burr is the opposite of the inverted cone in that the flat end is connected to the shank, and the tool is pointed at the end. Cone-shaped tungsten carbide burrs create countersinks and counterbores, perfect narrow contours, and surface machining.
You can also use Cone-shaped burrs for:
• Deburring edges of holes or slots
• Creating or enlarging notches
• Countersinking or counterboring screw holes
• Creating an edge bevel