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KEO 55370 Cobalt Steel Single-End Countersink, TiN Coated, 4 Flutes, 60 Degree Point Angle, Round Shank, 1/2' Shank Diameter, 1-1/4' Body Diameter: Industrial & Scientific. KEO 55370 Cobalt Steel Single-End Countersink, TiN Coated, 4 Flutes, 60 Degree Point Angle, Round Shank, 1/2" Shank Diameter, 1-1/4" Body Diameter: Industrial & Scientific. KEO 4-flute center reamers are versatile tools designed for countersinking holes for centers or for enlarging existing holes. Cobalt steel tools are similar to high-speed steel, but with more cobalt for improved performance when cutting harder metals such as stainless steel or nickel alloys. Titanium nitride coatings add a hard layer of gold-colored ceramic to the surface that extends tool life and permits faster cutting speeds than uncoated tools. Round shanks allow use with a wide variety of toolholding systems. When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging. degree angle. 。 。 。