Morse Cutting Tools 22521 Metric Chucking Reamer, Cobalt, Bright Finish, Straight Flute/Shank, 6 Flutes, 4.00 mm Size
M42 8% cobalt steel offers increased hardness, toughness, wear resistance and heat resistance. Recommended for reaming high alloy steels, titanium, Inconel, stainless steel and other difficult-to-ream materials. Longer tool life in production applications.