●Adopt spiral ball shape to improve sharpness of cutting edge．
●3-flute shape from R0.1 enables high efficiency machining even with small diameter．
●Strong back taper shape reduces cutting load and chattering．

●High-efficiency 3-flute ball end mill optimizes a shape of central edge and enables high depth of cutting．
●Even hardened steel of 60 to 70HRC can be machining with long tool life and high efficiency．
●Shank diameter tolerance，high accuracy type，is - 0.001mm ～ - 0.003mm．