＊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. ＊Total 62 sizes, some sizes line up with L/D = 2 or 3.