●Added longer effective length type to SSPB220 series．
●Realized deeper milling by adoption of spiral ball shape and strong back taper shape to improve both sharpness and the chipping resistance of cutting edges．

●Adopted spiral ball shape to improve sharpness of cutting edge．
●Adopted cutting edge shape to improve the chipping resistance of cutting edge．
●When peripheral cutting edge makes contact with cutting surface，vibration occurs by an increase in cutting resistance and it affects tool life and cutting surface quality．The influence can be reduced by adoption of the strong back taper shape．
●Enlarged standard tool size up to R3 to extend application range．

●Realized high efficient machining with radius flute along with excellent wear resistance of CBN．
●Realized excellent surface roughness by introducing smooth tangent on all over flute．
●Applicable for work materials from tempered steel to hardened steel (up to 70 HRC)．
●Lineup expansion from Dia．0．1mm． 172 sizes in total．