• For Carbon Steels, Alloy Steels (HB225-325), Pre-hardened Steels (HRc30~50), Cast Iron • Wave shape cutting edge to improve chip formation for low cutting force • Helical thinning for low thrust, stable torque and good chip breakage • Extremely high hardness and heat resistance due to YG-1 special Z- Coating technology • With or Without internal coolant holes