1High hardness, antirust, strong and durable, suitable for drilling, tapping and cutting of soft metals, aluminum plates, iron, etc. 2Self-centering point, no need for auxiliary center drilling or center punching. 3Drilling and tapping integrated, onestep processing, greatly saves processing steps and time costs, and improves work efficiency. 4This tap drill set has a unique design, at the same time drilling, tapping and chamfering. 5Accurate ground point, flutes, body, clearance, and drill diameters for the best accuracy and performance. Features:1. High hardness, anti-rust, strong and durable, suitable for drilling, tapping and cutting of soft metals, aluminum plates, iron, etc.2. Self-centering point, no need for auxiliary center drilling or center punching.3. Drilling and tapping integrated, one-step processing, greatly saves processing steps and time costs, and improves work efficiency.Specifications: Material: High-speed Steel (HSS) Suitable for soft metal, aluminum, iron Size: M3 x 0.5: Total length: 55mm, Spiral length: 24mm, drill diameter: 2.5mm Handle: 6.35mm (Notice: Manual measurement may be a little error please understand!) Package include:1 x Hexagonal Handle Compound Tap Drill Bits