＊Realize stable cutting performance even for 70 HRC hardened steels. ＊Developed new MUGEN COATING PREMIUM Plus to upgrade oxidation resistance and abrasion resistance. ＊Adopt optimized new tool material and tool design to reduce cutting load. ＊R accuracy is ±0.003mm (R accuracy is based on a half value of actual diameter). ＊Shank diameter tolerance, high accuracy type, is - 0.001mm / - 0.003mm.