Features:Cutting Edge Diameter (CED): 4.9mm / 0.193"Cutting Edge Length: 12mm / 0.472"Shank Diameter: 3.175mm / 1/8"Overall Length: 38.1mm / 1-1/2"Angle Point: 165 DegreeMaterial: Tungsten CarbideFlute Type: SpiralDescription:Long Tool Life: Made from tungsten carbide, high hardness, high wear resistance, high strength, resistance to bending, anti-impairment, long service life.Spiral Flute Bits: Spiral flute drill bits reduce cutting force and prevent drill broken, improve the drilling accuracy. Large drill bit chip space, chip resistance, chip smooth, small drilling heat.Precision: With with sharper cutting edge, milling groove and clean surface, the carbide PCB drill bits can work quickly and cleanly, no glitches or scrap left.Applications: Great for PC boards, plastics, fiberglass, wood, soft metals. Suitable for PCB drilling machines, engraving machine, CNC and high precision special drilling equipment.Tips: The drill bits are too tiny, so it is very fragile for handling. Please be careful and take good control of your CNC speed.Package Included:1pcs x PCB Drill Bits