＊This CBN Ball End Mill has realized both advantages of CBN and Carbide. ＊Depth of Cut can be increased at the equivalent level to Carbide. ＊Unique flute design with R-accuracy ±0.005 prevents chipping! ＊Flute is smoothly tangent from straight line to R-curve. ＊Applicable for harden materials up to HRC68.