Goodhd 20Pcs 1.2mm Diamond Coated Lapidary Drill Bits Solid Needle For Jewelry Agate

Features: *Lapidary drill bits made from diamond powder high-quality precise and durable to use. *Idea for drill holes on the jewelry ceramic jade agate glass amber and semiconductor materials etc. *The higher speed of drilling machine the better effect of drilling bits. *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 *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 Kindly Pay Attention: 1. Use cold water during the drilling hole operation 2. Use high-speed(Up 20000 RPM) to drill holes with our drill bits. 3. Be stable don t shake Specifications: *Material: Diamond *Color: Silver *Length: approx. 45mm *Diameter of Shank: 0.6mm *Diameter of Head: 1.2mm *Applications: jade agate stone crystal jewelry ceramic glass semiconductor material drilling *Place of Application: Drill Bit Small Bench Drill Mills Quantity: 20PCS Package Included: 20 x Lapidary Drill Bits 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 as standard.