Item Type: Engraving Bits Material: Tungsten Steel Total Length: Approx. 38mm / 1.49in Shank Diameter: Approx. 3.175mm / 0.12in Product Type: Flat Bottom Carving Handle Package List 10 x Engraving Bits 1Tungsten Steel: These CNC router V bits are made from premium tungsten steel, which is sturdy and durable, not easy to break. 210Pcs Engraving Bits: The package includes 10Pcs engraving bits with high hardness that can surely meet your needs 3Applicable Material: These CNC router V bits are suitable for acrylic, plastics, wood, fiberglass, carbon, printed circuit board, etc. 4High Reliability: Premium tungsten steel possesses the featuers of high hardness, wear resistance and high durability. 5Wide Application: These CNC router V bits are perfect for three dimensional sculpture, surface machining, 3D relief sculpturing, etc.