... For high speed cutting 2 Flute High Speed Tungsten Carbide Drill Bit1.High speed drill bit have three types ... with cooled(3xd), 2 Flute High Speed Tungsten Carbide Drill Bit With Cooled(5xd).2.AlTiN coating, ... speed can achieve 8000rpm. Heat resistance is 700°c~800°c.3.AlTiN-S coating, golden coating, applicative to ... is 8000rpm~20,000rpm, heat resistance is 1000°c~1200°c.4.Usage of coating: It has good ...