Features: Blue-nano coating, high temperature resistance, better processing. Have sufficient bending strength and wear resistance; High hardness, high wear resistance and high strength. Range of processing: PCB, Copper, Aluminum, ABS, Acrylic, PVC, Nylon, Resin, The majority of plastics, Wood, Fiberglass, Carbon. Use of ultra-fine grain carbide material with good milling, cutting performance, ensure high work efficiency. Sharp cutting edge, milling, hole and plate edge, surface clean, neat, no burr. Specifications: Material: Tungsten steel Type: Flat bottom engraving bits Shape: V-shape Degree: 10/15/20/25 Shank Diameter: 3.175mm Cutting edge diameter: 0.1mm -0.4mm Total length: 33mm Package size: 5.5*5.2*1.0cm/2.16*2.04*0.39in Package weight: 40g Note: Item color may show sight aberration due to different shooting light and monitor display. Packing list: 10pcs PCB Engraving Bits