＊Unequal flute spacing, unequal helix angle and high rigid end profile design to minimize chatter realize high efficient machining. ＊New developed special edge profile realized multi-functional performance of side milling, slot milling and plunging approaches on carbon steels. ＊Long time stable machining is realized by adopting MUGEN COATING. ＊Long neck type prevent interference with work material, the Under Neck length lined up with L/D = 3 to 5.