Micro Diameter End Mills 1.Cobalt:12% 2.Granularity:0.2-0.4 um 3.TiALN coating or without coating 4.Helix angle: 45° 5.Tolerance of flute Dia.:h8 Tolerance of shank Dia.:h6 6.High speed precessing 7.For HRC45-53 precessing 8.For aviation industry,cooler,heavy maching,cars,mould etc.