Check the listing for details. 20Pcs 1 mm Diamond Lapidary Drill Bits Solid Hole Saws Jewelry Gemstone Tools. Condition: New. Listed at 12.99 USD. 20Pcs 1 mm Diamond Coated Lapidary Drill Hole Solid Bits for Jewelry Gemstone Code 6# Product Description: Product Name: Lapidary Diamond Drill Bits, Diamond Drill Bits for Stone Jewelry, Gemstone Drill Bits Head Diameter : 1 mm Total length : 32mm Shank diameter: 0.6 mm Drilling speed: Drill a hole in seconds Quantity: 20Pcs Use with water as a lubricant Must drop water or put the stones in the water, during drilling hole operation. Max speed: 18000 RPM The higher the speed of machine, the effect of drilling hole is better Application: suitable for use in drill hole on the Jewelry, Gems, jade, agate, amber, beeswax, crystal Suitable Machine: high speed bench drill, bench drill, fixed drilling machine, etc. Note: The drilling hole needles are producted from factory directily, there is rust on needle’s handle, but not influence use. Quick Tips 1. During drilling operation, with machines can't use more than 1 kg of strength to press the needle, because the diameter of handle is very small, too big power will broken needle. 2. Suggest you use the machine to drilling hole, just like the chicken peck rice, drilling hole after a few seconds, lift up once, and then press the continue to drill. We Can List Any Size (Head Diameter 1mm/1.2mm/1.4mm/1.6mm/1.8mm/2.0mm/2.2mm ) & Amount Of This Product We will send out your order within 1-2 days after payment has been received and cleared. Please let us know if you are looking for other accessories or hardware.