[High Quality Material] CNC milling are made of high hardness wear-resistant tungsten steel, which is and less breakable than ordinary carbide CNC drill bits.[Efficient Cutting Performance]These precision mirror CNC engraving bits are designed with scientific chip to prevent wood chips from affecting your work. The cutting speed is fast, and the cutting surface is flat and .[Individual Packaging]4pcs per pack, each individually packed. Includes 1 15 detail drill, 1 20 drill, 60 and 90 V-groove drills.[Wide Application]These CNC milling are suitable for MDF, PVC, acrylic, solid wood, plywood, board, etc. Widely used for cutting/engraving/engraving/grooving/drilling/milling.Colour: silverMaterial: tungsten steelPackage Contents:4 * BitsOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.