PCB Drill Bits 0.2mm Tungsten Carbide Rotary Tool Jewelry Engraving CNC Printed Circuit Board Micro Drill Bits 1/8 Inch Shank 2 Set (20 pieces) - -. Specification: edge diameter (CED): 0.2 mm; edge length: 3.5 mm; shank diameter: 3 mm / 1/8 "(approx.) total length: 38 mm / 1-1 / 2" (approx.) . Spiral flute drills: Spiral flute drill bits with cutting edge, reduce the cutting force and prevent the drill from breaking, improve drilling accuracy . Long tool life: with high hardness, high wear resistance, high strength, flexural strength, anti-deterioration. Made of tungsten carbide for an easy and accurate experience . High precision: with a sharp edge, a milling groove and a clean surface, these tool sets work quickly and cleanly, without failures or waste . Features:Cutting Edge Diameter (CED): 0.2mmCutting Edge Length: 3.5mmShank Diameter: 3mm / 1/8" (approx.)Overall Length: 38mm / 1-1/2" (approx.)Cutting Edge Material: Tungsten CarbideShank Material: HSS (High Speed Steel)Package Included:2 Set (20 Pcs) x PCB Drill Bits with Protection BoxDescription:1. Long Tool Life: With high hardness, high wear resistance, high strength, resistance to bending, anti-impairment. Long-lasting bits are made from Tungsten Carbide for precise, easy experience.2. Spiral Flute Bits: Tip spiral flute drill bits with shaper cutting edge, reduce cutting force and prevent drill broken, improve the drilling accuracy.3. High Precision: With sharp cutting edge, milling groove and clean surface, these sets of tool work quickly and cleanly, no glitches or scrap left.4. 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.5. Good Replacements: Carbide PCB Drill Bits replace your CNC machines and any hand held tool. Large drill bit chip space, chip resistance, chip smooth, small drilling heat.Note: The drill bits are too tiny, so it is very fragile for handling. Please be careful and take good control of your CNC speed. . . .