Solid Carbide Drills DHC, DHN Solid Carbide Drills (for Hardened Steel) 內冷 & 外冷高硬用鎢鋼鑽頭 Drilling FEATURES ‧ High rigidity cutting design for hardened material ‧ Unique SINIX coating for wear resistance ‧ Internal coolant design to increase tool life ‧ 高剛性刀口幾何,專為高硬度材質加工設計 ‧ 特殊 SINIX 鍍膜,高效抗磨損 ‧ 內冷孔設計,更有效提升刀具壽命 C031