zhy600

-Micro Grain 0.2um/0.4um -Helix Angle 35 degree -HRC60~68, Co9%~12% -High aluminum coating drill bit -For high speed cutting 2 Flute High Speed Tungsten Carbide Drill Bit1.High speed drill bit have three types: Standard 2 flutes high speed drill bit, high speed 2 flutes short flute drill bit with cooled(3xd), 2 Flute High Speed Tungsten Carbide Drill Bit With Cooled(5xd).2.AlTiN coating, black, ...