Head Diameter Inch 18 Number of Flutes 6 Included Angle 82 Countersink Material Cobalt Countersink FinishCoating TiN Coated Shank Diameter Inch 18 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