HSS6542 Double Cutting Blades: Engineered for precision, our step drill bits feature double cutting blades that smooth, fast, and accurate drilling. The 118 split point tip enhances cutting speed and prevents deviation, making it ideal for materials including metal and wood. Titanium Coating: Each bit in this set is coated with titanium to enhance durability and reduce friction. This coating not only extends the life of the bits but also enables smoother cutting through tough materials, ensuring efficiency and in your drilling tasks. Versatile Applications: Perfect for DIY enthusiasts and professionals alike, these bits are suitable for drilling through plastics, aluminum, wood, and iron. For optimal performance, especially in metal, use coolant and maintain a moderate speed to prevent overheating. Comprehensive Set for Multiple Needs: This set includes three bits with varying step sizes to cover a wide range of drilling needs. From 4mm to 32mm, these bits are designed for creating holes of several diameters, making them a versatile addition to your toolkit. Specifications: B: HSS6542 spiral Colour:Gold Material:High Speed Steel Package Contents: 1 x Step Drill Bit Set 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.