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Use high quality materials and fine grinding process makes bit more for sharp cOwnMy OwnMy 40PCS Micro Drill Bits PCB Drill Bits 0.1mm-3mm Micro Drill Bits, Spiral Flute Carbide Print Circuit Board Drill B Package Includes: 2 Boxes of PCB Drill Bits (From 0.1mm to 1.0mm), 1 Box of PCB Drill Bits (From 1.1mm to 2.0mm) and 1 B20PCS Circuit Board Print Carbide Drill Bits with Reduced Cutting Force Quantity: 20pcs(2 set). 20x PCB Drill Bits. Use high quality materials and fine grinding process makes bit more cuttinguxcell uxcell PCB Drill Bits 0.4mm Tungsten Carbide Rotary Tool Jewelry CNC Engraving Print Circuit Board Micro Drill Bits 1/8 Specification: Cutting edge diameter (CED): 0.4mm; cutting edge length: 7mm / 0.28"; shank diameter: 3.175mm / 1/8" (app10pcs Circuit Board PCB Drill Bits Carbide Tungsten Steel Twist Drill Bits Au 10 X PCB Drill Bits. 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