Check the listing for details. 20Pcs Diamond Drill Saw Hole 1.4 mm Coated Lapidary Solid Bits for Jewelry Tools. Condition: New. Listed at 12.80 USD. 20Pcs 1.4 mm Diamond Coated Lapidary Drill Hole Needle Solid Bits for Jewelry Gemstone Code 4# Product Description: Head Diameter :1.4 mm Total length : 43mm Shank diameter:0.8mm Quantity:Total 20 Pcs Drilling speed:Drill a Holes in Seconds Use with water as a lubricant Must drop water or put the stones in the water, during drilling hole operation. Max speed:24000 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 1.2mm/1.4mm/1.6mm/1.8mm/2.0mm/2.2mm) & Amount Of This Product Head Diameter Shank Diameter Total Length Model 2.2mm 1.1mm 55mm 0# 2.0mm 1mm 54mm 1# 1.8mm 0.9mm 53mm 2# 1.6mm 0.9mm 53mm 3# 1.4mm 0.8mm 43mm 4# 1.2mm 0.6mm 32mm 5# We will send out your order within 1-2 days after payment has been received and cleared. Welcome to Visit My eBay Store: Jewelry Tools 1