1/2"-82 HSS Single Flute CountersinkMfr #: DEWSFC1 2 82 High speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance Single flute countersinks are ideal for chambering, deburring, and countersinking Round shanks allow use with a wide variety of toolholding systems Through hole flute style has a single flute that passes through the cutting head to reduce vibration and chip clogging; also called "zero flute"