This item is a set of 10 pcs professional PCB drill bit set. Imported tungsten carbide ensures its high hardness and endurance. The drill bit set comes in different sizes for each for meeting your using requirements. design drill bits with shaper cutting edge, reduce cutting force and drill breaking, improve the drilling accuracy. Great for drilling PC boards, plastics, fiberglass, wood, metals, etc. Feature - : adopts imported tungsten carbide, high strength, high hardness and endurance, great abrasion resistance, resistance to bending for longer working life and high work efficiency. - Extraordinary sharpness: Adoption of nanotechnology and advanced grinding technology, the cutting becomes sharper than before, which can reduce the cutting force and drill breaking, improve the drilling accuracy. - Strictly symmetrical cutting edge: Conducive to efficient cutting and avoids drilling deviation. - 10 Assorted sizes: The drill bit set comes in different sizes for each for meeting your using requirements. - Wide application: For drilling PCB, , CNC, , plastic, copper, stainless steel, fiberglass, wood, metals, engraving, jewelry making and other precision parts processing. Specifications - ColorAssorted Color - Material: Tungsten steel - diameter: 3.175mm - Full length 38.1mm - Bit diameter: 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm Package list: 1 x set of 10 drill bits