Dormer E054 Cobalt Steel Straight Flute Tap, For Cast Iron, TiAlN Coated, Round Shank With Square End, Modified Bottoming Chamfer, M10-1.25 Thread Size Hand threading tap with straight flutes cuts threads in through holes and blind holes Titanium aluminum nitride (TiAlN) coating lubricates the tap for high-temperature stability and abrasion resistance at high cutting speeds, offering better heat resistance than titanium nitride (TiN) and titanium carbon nitride (TiCN) coatings Available in Metric Coarse (M) or Metric Fine (MF) right-hand thread options for different applications Cobalt steel is harder than high-speed steel, for increased tool life and for tapping tougher metals Modified bottoming chamfer has additional length to reduce chip load, add tool life, and permit higher tapping speeds