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