20Pcs 1mm Small Diamond Drill Bits for Glass Jewellery, Diamond Coated Solid Bits Needle Gemstone Drill Bit for Jewelry, Agate

• 【Material】: The diamond drill bit is made of diamond powder, sturdy and durable, high strength, high pressure bearing, which can be used for a long time. These small drill bits are lightweight, compact and easy to handle.
• 【Dimensions】: Length: Approx. 37mm, Shank Diameter: 0.6mm, Head Diameter: 1mm, these diamond coated lapidary drill bits are lightweight, compact and easy to handle.
• 【Package】: 20 xdiamond drill bits, enough quantity to meet the installation needs of different projects and drill bits.
• 【Instructions for Use】: The higher the speed of the drill press, the better the effect of the drill, when installing these diamond glass jewellery drill bit tipped for drilling, the speed of the drill needs to reach 2000 RPM, please use cold water when drilling.
• 【Widely Applications】: 1mm drill bits are ideal for drill holes on the jewelry, ceramic, jade, agate, glass, amber and semiconductor materials etc.

Condition: 100% Brand New and High Quality Material: Diamond Powder Please Kindly Pay Attention: -Use cold water during the drilling hole operation -Use high-speed(Up 20000 RPM) to drill holes with our drill bits. -Be stable, don't shake -If you use the drill bit for many times, it will not be very sharp than the first time using.You could cut a little the top of it with plier, it will become sharp again Please Note: 1. Please allow some errors due to manual measurement. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.