Magafor 0895 Series Cobalt Steel Titanium Nitride (TiN) Combination Spotting Drill and Countersink Bit, 2 Flute, 90 Degrees Cutting Angle, 0.5" Cutting Length By using the magafor NC drill of diameter over the drilling tool, centering and chamfering are obtained in a single operation 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