Features 1、Engraving bits are made of tungsten steel material, high hardness, corrosion resistance and not easy to rust 2、Unique mirror friction treatment creates a perfect surface effect and reduces the chance of burning and deviation. 3、Mainly used for carving wood, MDF, aluminum, acrylic and other details engraving. 4、The product suitable for spring engraving tools, CNC milling machines, end mills, etc. 5、The tip is 0.3mm, the diameter of the shank is 4mm, and the total length is about 45mm. Specification Item Type: 2 Flutes Straight Grooves V Bits Material: Tungsten steel Color: Blue Specification: 4 x 0.3 x 30 Tip: Approx. 0.3mm / 0.01in Shank Diameter: Approx. 4mm / 0.2in Total Length: Approx. 45mm / 1.8in Purpose: Embossing / lettering / hole opening Application: Spring carving tools, CNC milling machines, end mills, etc. Package List 5 x 2 Flutes Straight Grooves V Bits