Six Flute, also called chatterless countersinks are designed to provide more metal removal than the 1, 2, 3, & 4 flute countersinks. They are also more effective on harder materials.
Drill America DEWCHAT Series 6 flute chatterless countersink is designed to provide more metal removal then the 1,2,3, and 4 flute countersinks. They are also more effective on harder materials. High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance. Round shanks allow use with a wide variety of tool holding 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".
From the manufacturer
Single Flute Countersinks
Single Flute Countersinks are ideal for chambering, deburring, and countersinking. They provide a smooth finish on a variety of materials
Six Flute, also called chatterless countersinks are designed to provide more metal removal than the 1, 2, 3, & 4 flute countersinks. They are also more effective on harder materials.
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