Features High Hardness and Durability--- Made from high-speed steel (HSS), these drill tap bits are designed to withstand tough drilling, tapping, and cutting tasks on soft metals, aluminum plates, and iron, ensuring long-lasting performance. Self-Centering Point--- With a self-centering point, there's no need for auxiliary center drilling or center punching. This feature simplifies the drilling and tapping process, saving you time and effort. Integrated Drilling and Tapping--- The unique design of this tap drill set allows for simultaneous drilling, tapping, and chamfering, streamlining your workflow and reducing processing steps and time costs. Accurate Ground Point and Flutes--- Each bit is precision-ground for optimal accuracy and performance. The accurate ground point, flutes, body, clearance, and drill diameters ensure precise results every time. Versatile Size and Handle Design--- With a size of M4 x 0.7, these drill tap bits are suitable for various applications. The hexagonal handle with a 6.35mm shank provides a secure grip and compatibility with most power tools. Specifications: Material: High-speed Steel (HSS) Suitable for soft metal, aluminum, iron Size: M4 x 0.7: Total length: 54mm, Spiral length: 24mm, drill diameter: 3.3mm Handle: 6.35mm (Notice: Manual measurement may be a little error please understand!) Package include: 1 x Hexagonal Handle Compound Tap Drill Bits Package List