Description: This product uses first-class diamond powder and is made with precisionUses: used for grinding of molds, grinding of inner holes, fine workmanship, reliable quality, suitable for electric grinder, engraving machine, electric machinery supporting assembly, mainly used for engraving glass, jade, repairing abrasive tools and hard objects .Shape: grinding needleMaterial: DiamondGranularity: 120 (mesh)Outer diameter: 3.175mmShank diameter: 3mmTotal length: 45mmQuantity: 20/30pcs Package included: 20/30pcs Diamond Burr Bits Drill
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