Ilovetool 0.4-2mm Diamond Jewelry Cutting Drill Bits BUR Stone Tools Set of 30

• Product Name: Diamond Lapidary Drill Bits, Gemstone Drill Bits
• Head Diameter: 0.4mm-2mm, Drilling Depth: 2.5-10mm Depth
• Quantity: 30 pieces, total length: 42 mm (1-21/32 inches), shaft diameter: 2.35 mm (3/32 inches).
• Material: metal, diamond, color: silver tone, drilling speed: drill a hole in seconds.
• Use with water as a lubricant, used for sculpting, dressing, precision grinding and carbide internal grinding of ceramic, glass, gemstone, alloy and many abrasive materials.

30pcs 0.4mm-2mm Diamond Hole Saw Bits Solid for Jewelry Beads Glass Tile Ceramic Marble Granite Code DKZ-30PCS-0.4-20mm(4A-20A) The diamond coating hole saw suitable for use in drilled hole on jewelry, gemstones, glass, marble, tile or granite. Head diameter: 0.4mm-2mm Total Length: 42mm (1-21/32") Drilling Depth: 2.5 - 10 mm Depth Shank Diameter: 2.35mm (3/32") Quantity: 30 pcs Material: Metal, Diamond Colour: silver tone Drilling Speed: Drill a hole in seconds Use with water as lubricant Quick tips 1. Please add water for cooling and drill slowly 2. Start drilling at 45 degrees to the surface and align 90 degree into hole shapes 3. Never use exercises while the machine is a hammer in action. 4. Holes do not need to function as a clean cut We can list all sizes (head diameter 0.4mm - 3mm) and quantity of this product Regularly fresh air postage from China to the world is free and takes 10-35 days delivery to your home We will send your order within 1-2 days after payment has been received and cleared. Please let us know if you are looking for other accessories or hardware. If you have any questions, please contact me directly.