Features 1、High quality tungsten steel material, features high hardness and strength, corrosion resistant and rustproof. 2、With a unique mirror grinding processing for cutting edge produces an excellent surface finish. Reduce chance of burr and deviation. 3、Perfect choice for carving and engraving details. Suitable used for the engraving and marking of wood, MDF, aluminum, acrylic. 4、Ergonomic design, simple operation, high work efficiency, time‑saving and labor‑saving. 5、Light weight, portable design, this engraving bit is easy to install and convenient to use. Specification Item Type: Engraving Bit Material: Tungsten steel Color: Blue Coating Specification: 4 x 0.4 x 20 Tip: Approx. 0.4mm/0.016in 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