Features: High-speed steel , it is wear-resistant and has strong heat resistance, making it suitable for drilling holes in various materials such as metal and plastic. The unique stepped shape allows the drill bit to gradually enlarge the apertures, making it convenient to complete multiple drilling holes of different diameters at once. The hexagonal handle can effectively prevent slipping and is suitable for various electric and manual tool, providing a stable operating experience. The small size design is suitable for small apertures requirements and is suitable for precisions engineering, electronic products, and daily DIY projects. Both professionals and home users can easily get started and complete their work quickly. Specifications: Material:High Speed Steel Type:Small Hexagonal Shank,Straight grooves,Spirals grooves,6Pcs Set Package Includes: 1/6Pcs Step Drill Bit note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color of the item.