Descriptions: _x000D_Our lapidary drill bits are made from diamond powder, precise and sturdy. It is perfect for drilling holes on the jewelry, ceramic, jade, agate, glass and amber etc. Using high-speed of drilling machine to drill will lead to a good drilling effect. Please use cold water to drill. Our drill bits are very sharp and you could use them for many times. It is a good drilling tool for you to choose from. _x000D__x000D__x000D_Features: _x000D_Made from diamond powder, high-quality, precise and durable to use. _x000D_Idea for drill holes on the jewelry, ceramic, jade, agate, glass, amber and semiconductor materials etc. _x000D_The higher speed of drilling machine, the better effect of drilling bits. _x000D_The speed of drilling machine need to be reached 20000 RPM when you use our drill bits to drill holes. _x000D_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. _x000D__x000D__x000D_Please Kindly Pay Attention: _x000D_-Use cold water during the drilling hole operation _x000D_-Use high-speed(Up 20000 RPM) to drill holes with our drill bits. _x000D_-Be stable, don't shake _x000D__x000D__x000D_Specifications: _x000D_Condition: 100% Brand New and High Quality _x000D_Material: Diamond Powder _x000D_Color: Silver _x000D_Length: Approx. 36mm _x000D_Diameter of Shank: 0.6mm _x000D_Diameter of Head: 1mm _x000D_Weight: Approx. 4g _x000D_Quantity: 20PCS _x000D__x000D__x000D_Package Included: _x000D_20 x Lapidary Drill Bits _x000D__x000D__x000D_Please Note: _x000D_1. Please allow some errors due to manual measurement _x000D_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. 1Made from diamond powder, high-quality, precise and durable to use 2The speed of drilling machine need to be reached 20000 RPM when you use our drill bits to drill holes 3The higher speed of drilling machine, the better effect of drilling bits 4please use cold water during the drilling hole operation 5Idea for drill holes on the jewelry, ceramic, jade, agate, glass, amber and semiconductor materials etc