[Specially Designed] These sharp drill bits allow for accurate, smooth, and clean hole drilling, even in materials with particles or knots. The curved head design helps remove sawdust quickly, improving efficiency. [Material] Made from high-hardness steel, these drill bits offer excellent wear resistance, toughness, heat resistance, and corrosion resistance. The shank is constructed from steel 45. [Specifications] Suitable for drilling holes in solid wood, cork, hardwood, plywood, medium density fiberboard (MDF), particleboard, plastic, rubber, and glass fiber. Compatible with drilling presses, bench drills, vertical drilling machines, and CNC engraving machines. [Caution] 1. Contains sharp parts – keep away from children and pets. 2. Not intended for metal processing; using on metal may damage the drill bit. 3. Secure the material firmly during operation and maintain the drill bit perpendicular to the surface. 4. Begin drilling at a slow speed until the bit is fully engaged, then gradually increase speed. 5. When drilling hardwood, apply water to enhance accuracy and hole quality. Color: Silver Material: Steel Sizes: 12 mm, 15 mm, 17 mm, 20 mm, 23 mm Package Contents: 1 x 12 mm Drill Bit 1 x 15 mm Drill Bit 1 x 17 mm Drill Bit 1 x 20 mm Drill Bit 1 x 23 mm Drill Bit Note: The package includes only the items listed above. Other accessories are not included. Note: Lighting and display settings may cause slight color variations between the image and the actual item. Measurement tolerance: ±1–3 cm.