Countersinks expand the top of an existing hole in a workpiece to ensure screws install flush with the surface of the workpiece. This helps prevent the workpiece material from swelling when a screw is installed in the hole and tightened down in metalworking applications. Countersinks can also be used to debur holes for a smooth finish.
Threaded Shank 3-Flute Countersinks
100 ° Included Angle + Cobalt
100 ° Included Angle + High Speed Steel