Hengcheng's newly developed double-spiral internal cooling rod has wide versatility, especially in hole processing applications of difficult-to-machine materials. In addition, for rough machining of stainless steel and titanium alloy milling, Hengcheng’s newly designed and developed 12E bar grade has excellent hardness and toughness matching characteristics, which can avoid early wear and chipping of the tool and extend the service life of the tool. At the same time, the high toughness of the material itself can provide higher processing stability for the tool.