CNBTR 2mm Gems Engraving Drill Bits Diamond Coated Tip Jade Engrave Silver Pack of 20

• It suitable for use in drill hole on the Jewelry, Gems, jade, agate, amber, beeswax, crystal.
• Excellent for making accurate hole on glass, tile and marble.
• Dimension: 2.3 x 43mm/0.09 x 1.69"(Dia x L)
• Start your hole diagonally, make a round trace and then hold drill straight.
• This diamond coated core drill bit removes a complete circle from glass, tile, marble, granite, ceramic or other materials and needs water for lubrication.

Material: Metal, Diamond Color: Silver Shank Diameter: 2.3mm/0.09"" Head Diameter: 2.0mm/0.08"" Sand length: 6-8mm Full length: Approx. 43mm/1.69"" Dimension: 2.3 x 43mm/0.09 x 1.69""(Dia x L) Weight: 26g Features: It suitable for use in drill hole on the Jewelry, Gems, jade, agate, amber, beeswax, crystal. Drill a Holes in Seconds Use with water as a lubricant Must drop water or put the stones in the water,? Note: Add water for cooling and drill slowly. Package Include: 20 x Diamond Coated Hole Drill Bit Generally, the punching needs to be imported slowly when starting to punch, and then punch hard after entering the mouth. Like harder stones, or ice, miscellaneous stones, agate, etc., punching may not be . It is recommended to add emulsified oil to the water to lubricate harder stones.