High-Quality Material: These step drill bits are made of bearing steel for durability and powerful performance, making them an ideal addition to any workshop. Versatile: Suitable for drilling holes in a variety of materials, including metal and wood. This set includes sizes 4-12mm, 4-20mm, 4-32mm, and 3-8mm, ensuring you have the right tool for any job. Drilling: These drill bits feature a flute structure and a forked tip design for faster, smoother cutting and prevents tool slippage. Efficient Design: Each step drill bit features a double-fluted design for faster, smoother cutting, reducing friction and heat. Versatile Application: Ideal for home DIY projects and general construction/engineering use. Ideal for installing door locks, door handles, and cabinets, or drilling larger diameter holes in objects like tables. Color: As Shown Material: Bearing Steel Package Contents: 6 x drill bits 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.