50 Pcs PCB Drill Bit Set Tungsten Carbide Micro Drill Bits 0.25 0.3 0.35 0.4 0.45mm((10 Pcs Each) 1/8'' Shank for Print Circuit Board CNC Engraving Jewelry - Firearth, PCB00250045

• 1. Package include 50pcs PCB drill bits, 1/8''(3.175mm) shank.This Set contains 5 different size drill bits diameter: 0.25mm 0.3mm 0.35mm 0.4mm 0.45mm, each size have 10 pcs. 2.The PCB Drill Bits are made of high quality tungsten steel, highly wear resistance, high hardness, bending strength, anti-impairment, highly working efficiency.Stable and reliable during the engraving process 3. Packaged in a plastic case per 10 pieces for easy storage to identify size, easy to carry, and to better protect the tip of the drill bit from damage during transportation. 4. No burrs or debris,great for PC Boards, Plastics, Fiberglass, Wood, Soft Metals,3D printer nozzle cleaning, circuit boards, bakelite, CNC engraving machine,PCB drilling machines, jewelery, stone，metal plastic and other precision drilling 5. Tip spiral flute drill bits with sharper cutting edge, reduce cutting force and prevent drill broken, improve the drilling accuracy, and effectively discharge accumulated chipsWith sharp cutting edge, milling groove and clean surface, these sets of tool work quickly and cleanly, no glitches or scrap left.The positioning ring design, can reduce installation and commissioning time