[Specially designed] With these drills, you can drill holes accurately, smoothly and neatly, even if there are particles and nodules at . The curved design head helps to remove sawdust faster and make your work more efficient. [Material] It has the advantages of high hardness, wear resistance, toughness, heat resistance and resistance. The handle is made of steel 45#. [Specification] Suitable for cutting holes in solid wood, cork, hardwood, plywood, medium density fiberboard, particleboard, plastic, rubber and glass fiber. It can be used in drilling , bench drill, vertical drilling machine, CNC engraving machine, etc. [Caution] It contains parts. Please keep away from children and pets. 2. Do not use it for metal processing, otherwise the drill bit be soon. 3. The material must be fixed in the cutting process, and the drill bit should be perpendicular to the material. 4. Set the slow drilling speed until the drill bit is fully positioned, and then gradually accelerate the speed. 5. When processing hardwood, water should be injected to improve the drilling accuracy and quality. Colour:Silver Material:steel Size:12 Mm, 15 Mm, 17 Mm, 20 Mm and 23 Mm Package Contents: 1 * 12mm drill bit 1 * 15mm drill bit 1 * 17mm drill bit 1 * 20mm drill bit 1 * 23mm drill bit Only the above package content, other products are not included. Note: Light reflection 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.