Micro grain raw material Grain size: 0.4-0.6μm Co 10%, 12% TRS >3600 N/mm2 Hardness HRA 91.8-92.5 Work piece HRC55 Helix angle 35 ° Diameter of cutting edge 0.2-0.9 mm; 1-20 mm Diameter of rods 4-20 mm Length 50-100 mm Cutting Form Flat, Square, Ball nose, Corner Radius, Taper Flute, etc Flutes No. 1-7