-Micro Grain 0.2um/0.4um -Helix Angle 35 ... ZHY-600 series drill bit, grain size 0.4um, Co12%, HRC60, AlTiN coating, ... 0.2um, Co9%, HRC65~68, AlTiN-S coating, Sandvik material, for high speed cutting.8.Other products: carbide end mills, carbide ... inserts, collet, chuck, tool holder, tool heads, carbide rod, reamer, nut, spanner, etc. ZHY 2 Flute High Speed Tungsten Carbide ...