... -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 ... Co, the better wear-resistance.6.ZHY-600 series drill bit, grain size 0.4um, Co12%, HRC60, ... 8.Other products: carbide end mills, carbide inserts, collet, chuck, tool holder, tool heads, carbide rod, reamer, nut ...