Head Diameter Inch 58 Number of Flutes 6 Included Angle 90 Countersink Material Cobalt Countersink FinishCoating TiN Coated Shank Diameter Inch 38 Made from premium M42, 8 cobalt HSS Excellent for countersinking abrasive, highstrength, heat resistant, exotic and other difficult to machine materials TiN coated for higher surface hardness and better lubricity to enhance productivity and longer tool life