Endmills tipped with CBN, which is the second hardest material after diamond, are offered in sizes ranging from 6mm down to 0.1mm in diameter, with various configurations, from sharp corner, radius corner, ball, standard neck length and extended neck length. TOWA offers their CBN endmills in multi-flute configurations. By maintaining the same feed per flute, and increasing the number of flutes, cutting time is reduced, while profitability is increased. The CBN series of endmills, due to the hardness of the CBN, is an excellent choice for machining harden materials in the range of 55 to over 60 Rockwell “C”.