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Specification: Shank diameter: 3.175mm Degree: 15° Cutting edge diameter: 0.1mm 0.2mm 0.3mm Total length: 38mm Shape: Pyramid Material: Tungsten steel Features: This set of Pyramid carbide engraving bits is perfect replacements for your CNC machinery, make you enjoy a precise, easy cutting experience. Made of Tungsten steel high construction tools A power tool for 2D sculpture, 3D sculpture Application: Majority of plastics ,Copper, aluminum, iron, jade and other hard materials engraving and cutting fine, Acrylic, PVC, Nylon, Resin, Wood, Plywood, Hardwood, Fibre glass, marble, etc Package include: 10PCS 3A Precision grinding engraving bits