Features:* .* Made of high-quality material, and practical to use.* The holes are neat, smooth, no broken edges and no shaking.* The cutting resistance is small, the hole opening speed is increased, and the chip removal is easy.* It can be used to open holes in various wood boards, wood products, plastics, plywood and other materials.* The installation is simple and easy to use. It only needs to be installed on an ordinary electric hand drill in use.* Low noise during operation.* Suitable tools: electric drill with a chuck greater than or equal to 10MM, bench drill, high power electric grinder, pneumatic drill, magnetic drill, pistol type drill.* Scope of application: this series of products can make delicate perforations needed for all kinds of wood, wood products, plastics, plywood and other materials. It is suitable for industrial hinge installation, woodworking and preservation, modeling, spherical door end assembly, drawer ends, etc. Specifications:Color: YellowMaterial: YG6 alloy cutting head, 45# carbon steel knife bodyType: 16mm, 18mm, 20mm, 22mm, 24mm,26mm,28mm,30mmPackage Included:1 × Drill BitsPlease note:-Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!-Manual measurement, please allow 1-3cm error. Thank you for your understanding.