Mxfans 20 x 1.5mm Lapidary Drill Bit Diamond Coated Hole Drill Bits for Gems Jewelry Beach Sea Shells Pack of 20

• This diamond coated core bit can remove a whole circle from ceramic tiles, marble, granite, ceramics or other materials, and only needs water.
• It is very suitable for making accurate holes on tiles and marble.
• Scope of application: jade, agate, emerald pearl shell, drilling needle bit, crystal engraving grinding head
• Usage: Make sure to drain water for cooling (similar to the drip device used in hospitals). For example, dry drilling, the diamond on the tool head will be graphitized due to overheating, and will soon be worn With light pressure feeding, diamond tools are used to process workpieces by grinding. If too much force is applied, it is difficult to remove the grinding powder, and tools (especially small tools) are also easy to be damaged.
• They have multilayer industrial diamond particles bonded to the main body, thus prolonging the life of the bit.

Safety instructions: 1.Drill bit tools permanently enclosed in a cartridge or housing with less than 2mm of tool exposed. 2.The bladed product is not use for people under 18 years. 3.The item is only use for industrial engraving, not hazardous article. Note: The color of the item may vary slightly due to photography and your own computer Feature: This diamond coated core drill bit removes a complete circle from tile, marble, granite, ceramic or other materials and only needs water. Excellent for making clean and accurate hole on tile and marble. High quality and long life span. Start your hole diagonally, make a round trace and then hold drill straight. Add water for coolant and drill slowly. Specification: Material:Metal,Diamond Color:Silver Shank Diameter: 2.3MM Head Diameter: 1.5mm Sand length: 6-8MM Full length: 42mm Dimension:2.3 x 42mm/0.09 x 1.65"(Dia x L) Weight:25g Package Include: 20 x Diamond Coated Hole Drills Note:There would be some deviation. Warm reminder: Drill bit generally need to be drill slowly on the stone when start to drill, wait for the stone to open hole and then drill hard. If it is used on hard stone, it is recommended to add emulsified oil. Instructions:It must be cooled with water. If dry drilling is performed, the diamond on the tool head will be graphitized due to overheating, which will quickly wear . Light pressure feed, diamond tools rely on grinding to process the workpiece, excessive force, grinding powder is not easy to eliminate , tools (especially small tools) are also easily damaged.