Check the listing for details. 20PACK 0.3mm Micro PCB Drill Bits Carbide CNC Engraving Circuit Board Tool. Condition: New. Listed at 15.25 USD. CNC Engraving Drill BitsGeneral Information：[1]Great Use: Great for PC Boards, Plastics, Fiberglass, Wood, Soft Metals. Fit for: PCB drilling machines, engraving machine, CNC and high precision special drilling equipment[2]Long Tool Life: With high hardness, high wear resistance, high strength, resistance to bending, anti-impairment. Made from Tungsten Carbide for precise, easy experience[3]Spiral Flute Bits: Tip spiral flute drill bits with sharper cutting edge, reduce cutting force and prevent drill broken, improve the drilling accuracy[4]High Precision: With sharp cutting edge, milling groove and clean surface, these sets of tool work quickly and cleanly, no glitches or scrap left[5]Specification: Cutting edge diameter (CED): 0.3mm; cutting edge length: 5.5mm; shank diameter: 3mm / 1/8" (approx.) overall length: 38mm / 1-1/2" (approx.).