＊Improved designs of unequal helix angle and flute spacing. Suppression from chattering to realize stable milling progression. ＊Original spiral design at corner radius flutes improves cutting edge performance! ＊ Designed for high rigidity to suppress corner radius flute breakage even on rough millng stresses. ＊Adopted Mugen Coating Premium. Suppression from chattering to realize stable milling progression. Improved heat resistance and cutting edge strength to protect from milling heat influence.