... -HRC60~68, Co9%~12% -High aluminum coating drill bit -For high speed cutting 2 Flute High Speed Tungsten Carbide Drill ... grain size 0.4um, Co12%, HRC60, AlTiN coating, Kennametal material, for high speed cutting.7.ZHY-650 series drill bit, grain ... material, for high speed cutting.8.Other products: carbide end mills, carbide inserts, collet, chuck, tool holder, tool heads, carbide rod, reamer, nut, ...