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One Flute Spiral Bits Micro - Grain Solid Carbide CNC Carbide Bits For Precessing Aluminium Alloy Description: Bits are made of micro-grain solid carbide, Produced by Walter CNC grinding machines. This series of tools cause low noise when cutting.It is of high strength, thus there are no marks,no cracks on cutting surface and no broken line traces in the carvesegment.The cutting surface turns out matt effect. Rotating speed: 12,000-40,000 min OEM and ODM are available