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Check the listing for details. 10pcs 1.9mm Titanium Nitride Coated Carbide PCB CNC Drill Bits Router. Condition: New. Listed at 13.68 USD. Description: Carbide rods and tungsten steel rods, with high hardness, high wear resistance, high strength, resistance to bending, anti-impairment and long tool life. coated with titanium:Improve the speed and feed rate of the tool ,Improve the surface wear resistance. Great For: PC Boards, Plastics, Fiberglass, Wood, Soft Metals, etc. Material: Blade Carbide (Tungsten Steel) Specification: Shank Diameter (SD): 3.175mm Cutting Edge Diameter (CED): 1.9mm Total length: 38mm±0.20mm Angle: 135° Package Include: 10x PCB CNC Drill Bits Router.