10pcs Pcb Kit Blue Nano Rotary Burrs Shank 3mm Tungsten Carbide End Etching Set(0.8-3.175mm) The product is shipped based on the color or size of the main image of the product page. [Material] Crafted from tungsten carbide and enhanced with a blue nano coating for excellent milling and cutting performance with high work efficiency. [Advantage] These engraving drill bits offer substantial resistance to bending and wear. The well-polished surfaces are neat and clean, free from interference or burr on the shaft. [Advantage] Nano-coating technology significantly extends the product's lifespan, making it suitable for groove milling, hole boring, and edge grinding. [Application] Ideal for PCB, SMT, CNC, molds, plastic fiber, carbon fiber, extremely hard wood, circuit boards, and other precision parts processing. Constructed from tungsten carbide with a blue nano coating for impressive milling and cutting performance. The 1/8 straight shank fits standard rotary tools with a three jaw chuck for precise centering. A great option for carving, engraving, and polishing. These cutters exhibit high hardness, wear resistance, heat resistance, and anti-corrosion properties, offering excellent milling performance without dust pollution, and are stable and reliable. They are widely used in tool making, model making, wood carving, jewelry making, welding, casting, deburring, grinding, and carving. Specifications: Material: Tungsten Carbide + Nano Blue Coating Shank Diameter: 3.17mm (1/8 inch) Cup Diameter: 0.8/1.0/1.2/1.5/1.6/1.8/2.0/2.4/3.0/3.175mm Length: 38mm (1.5 inch) Quantity delivered: 10 pieces Do not use on materials that are excessively hard, such as high hardness iron.