Features 1、Made of premium tungsten steel for high hardness and strength, anti‑corrosion and rustproof. 2、With mirror polishing processing, the surface is smooth, reduce chance of burr and deviation. 3、Suitable for the engraving and marking of wood, MDF, aluminum, acrylic, ideal for carving details. 4、The design accords with ergonomics, simple operation, high work efficiency. 5、Total of 5pcs engraving bit, practical and economical, it can completely meet your needs. Specification Item Type: Engraving Bit Material: Tungsten Steel Color: Blue Coating Specification: 4 x 0.3 x 20 Tip: Approx. 0.3mm/0.01in Shank Diameter: Approx. 4mm/0.16in Total Length: Approx. 45-50mm/1.8-2in Purpose: Embossing / lettering / opening Application: Spring loaded engraving tools, CNC milling machines, end mill holders and etc. Package List 5 x Engraving Bit