New Thinning shape
Because of low thrust, achieved excellent biting property. From biting till hole ends therefore, possible to get accurate hole size and position

New margin shape
New margin shape has rigidity and burnishing action, which reduce frictional resistance and cutting force resistance.

Smoothing process for flute
Favorable chip shape from low-speed machining to high-speed machining. Good chip evacuation machining is realized even drilling depth is 5D and 8D.