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High Speed Steel THREE FLUTE Arc Round Flute Type Countersink Bits 1.Good quality 2.Satisfactory service 3.Customized design is accepted DIN335C, straight shank, 90 DEGREE; Useful: For all ferrous and non-ferrous metals, More efficiently than straight flute type and longer tool life. General purpose chamfering/ deburring and countersinking tool e.g. for tapping size holes. Product Size:Diameter: 4.331mm Top Cutter: 1.3-4.2mm; Shank Size: 4mm-12mm; MOL: 40-71mm; Material: M2 HSS, M35 Hss Co available; Coating: TiN, TiCN, TiAln Coated are avaiable;Different coating provides longer tool life or increase cutting speeds. 60/82/90 deg points and single flute,4flutes,5flutes,6flutes for your choice