30pcs 2.5mm Cylinder Flat Diamond Bit Grinding Needle Power Grinder Carving Tools for Jades Engraving Feature:1. 30pcs/set, 150 grit drilling bits with 2.5mm/0.10in grinding head, 3mm/0.12in shank diameter and 45mm/1.77in length.2. Cylindrical shaped flat drill bits for fine-detail drilling with the cutting power of diamond.3. Black nickel treatment, greatly improve the hardness, improve the efficiency of engraving.4. CNC milling handle bar without skipping, ensures the stability of grinding.5. High-strength and high-temperature resistant, and will not drop sand. Specification:Condition: Item Type: Grinding BitsMaterial: DiamondColor: As Pictures ShownGrit: 150 GritShank Diameter: Approx. 3mm/0.12inLength: Approx. 45mm/1.77inBit Diameter: Approx. 2.5mm/0.10inQuantity: 30pcs/setPackage List:1 x 2.5mm Grinding Bits Set (30pcs)Note:1. The grinding bits shall be clamped firmly when installing, and there shall be no pulsation!2. The rotation speed should be as high as possible, and the linear speed should be no less than 1020 m/s.3. This product is 3mm handle, please check the clamping range of the machine before purchase! 1) We accept Alipay, West Union, TT. All major credit cards are accepted through secure payment processor ESCROW. 2) płatność musi być dokonana w ciągu 3 dni od złożenia zamówienia. 3) If you can't checkout immediately after auction close, please wait for a few minutes and retry Payments must be completed within 3 days. About shipping 1.