Specifications: Material: High Speed Steel (HSS); Suitable for soft metals, aluminum and iron; Size: M8 x 1.25: Total Length: 59mm, Spiral Length: 18mm, Drill Bit Diameter: 6.8mm Shank: 6.35mm; Package includes: 1 x Hex Shank Composite Tap Drill Bits (Note: Manual measurement may (there will be a slight error, please understand!) 1. High hardness, anti-rust, strong and durable, suitable for drilling, tapping and cutting soft metals, aluminum plates, iron, etc., 2, Self-centering point, no need for auxiliary center drilling or center punching, 3, Integrated drilling and tapping, one-step processing, greatly saves processing steps and time costs, and improves work efficiency. 4. This tapping drill set has a unique design, both for drilling, tapping and chamfering, 5. Ground point, flutes, body, clearance. and precise drilling diameters for optimum accuracy and performance,