1mm Diamond Glass Jewellery Drill Bits Tipped, 1mm Diamond Coated Lapidary Drill Bits, Solid Bits Needle, Agate Drill Bit for Jewelry Agate, 20pcs/Pack

Product description

• Material Lapidary drill bits made from diamond powder, high-quality, precise and sturdy to use
• Applications Drill bits is idea for drill holes on the jewelry, ceramic, jade, agate, glass, amber and semiconductor materials etc
• Diamond Coated Lapidary Drill Bit The higher speed of drilling machine, the better effect of drilling bits
• Instructions for Use The speed of drilling machine need to be reached 2000 RPM when you use our drill bits to drill holes.please use cold water during the drilling hole operation
• Precautions 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