ITEM NAME:1PC Carbide PCB Engraving Bits CNC Router Tools 3.175*3.0mm Cutter Bit OHK FT Advantage: High-precision tool grinding large capacity Chip elimination, high efficiency and good quality of products A power tool for 2D sculpture, 3D sculpture A Wide Range of Materials can be engraved, including: Copper, Aluminum ABS, Acrylic, PVC, Nylon, Resin Majority of plastics Wood Fibre glass Carbon Specification: Type: Flat bottom engraving bits Shank diameter: 3.175mm Cutting edge diameter:3mm Total length: about 30mm Pack size: 1PC.Type: Flat bottom engraving bits. large capacity Chip elimination, high efficiency and good quality of products. ABS, Acrylic, PVC, Nylon, Resin. Copper, Aluminum.