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X Series Mirco Grain ball-end cutter R0.5-R10mm, 2Flute-4Flute helix angle: 30  (35 , 45  optional) Up: HRC45 High-Speed 1. Ultrafine carbon rod Micrograin: WC = 90, 10 cobalt, the TRS> 3800N/mm2; hardness> 91.8HRA, grain size: 0.5 micron, high wear resistance and impact qulaity 2. Manufactured by the world's newest five-axis tool grinder, tool to ensure the quality and accuracy. 3. Super TiAlN, reduce friction coeffiction, improve tool life. 4. Each cutter is measuring and testing equipment as Chazuo Le. 5. We accept your request, as a specification. 6. carbon steel, alloy steel, cast steel, die steel, die steel, heat treament steel. Alloy steel, nonferrous metal alloy