... -High aluminum coating drill bit -For high speed cutting 2 Flute High Speed Tungsten Carbide Drill Bit1.High speed drill bit have three types ... 0.4um, Co12%, HRC60, AlTiN coating, Kennametal material, for high speed cutting.7.ZHY-650 series drill bit, grain size 0 ... 2um, Co9%, HRC65~68, AlTiN-S coating, Sandvik material, for high speed cutting.8.Other products: carbide end mills, carbide inserts, ...