[Features]● The shank neck is hardened to improve grinding capacity and durability. ● Can be used for a wide range of applications, from internal micro-hole drilling to outer diameter rough grinding. ●It has good sharpness, and can minimize distortion due to grinding burn and heat even under low peripheral speed conditions and dry cutting. ●Suitable for hardened steel materials (SKH, SK, SKD, SUS, SCM, FC, heat-resistant alloys, etc.).