10pcs Pcb Kit Blue Nano Rotary Burrs Shank 3mm Tungsten Carbide End Etching Set(0.8-3.175mm) Jiujiuso The product is shipped based on the color or size of the main image of the product page. [Material] Made of tungsten carbide and blue nano coated good milling and cutting performance high work efficiency [Advantage] These engraving drill bits have sufficient resistance to bending and to wear. Well-polished surfaces are quite neat, clean, and there is no interference or burr on the shaft. [Advantage] Nano-coating technology greatly increases the service life of the product and suitable for groove milling, hole boring and edge grinding [Application] PCB, SMT, CNC, mold, plastic fiber, carbon fiber, super hard wood, board circuit board and other precision parts processing Made of tungsten carbide and blue nano coated good milling and cutting performance high work efficiency 1/8 straight shank can be held by anyone which rotary tool with three jaw chuck for precise centering. A good choice for carving, engraving and polishing. These cutters in high hardness, wear resistance and heat resistance, anti-corrosion, excellent milling performance, no dust pollution, stable and reliable. are widely used for 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) Diameter of the cup: 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 for materials that are too hard, such as high hardness iron