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HSS 6 Flute Countersink Sets. High Speed Steel Material: Made from super quality M2 HSS with optional HSS Cobalt. Customized Size Range: Available in sizes from 1/8 to 3 Inch. Enhanced Hardness Treatment: Special black finish treatment increases hardness to 64 HRC. Six Flute Design: Six cutting edges ensure fast shearing, centering, and chatterless cuts. Various Coating Options: Kinds of coatings available to suit different applications. Wide Standard Compliance: Meets ANSI, DIN, JIS, and AISI standards. Fine Finish Quality: Produces exceptionally fine finish with smaller chip load.