Features： 1、SPIRAL GROOVE DESIGN: The tap adopt spiral groove design, the chip removal effect is better, more efficient 2、HIGH HARDNESS AND LONG LIFE: Using high speed steel material, possess high hardness and long life, wear resistant and durable 3、WIDE RANGE OF APPLICATIONS: Can be drilled in copper, brass, aluminum, metal plates and plastics for a wide range of applications 4、DURABLE AND CORROSION RESISTANT: Metric tap drill come with Ti plated surface, durable and corrosion resistant 5、SAVING TIME AND EFFORT: Drilling and tapping can be carried out at the same time, saving time and effort, very practical Specification： Item Type: Combined Tap Drill Material: High speed steel Surface Treatment: Surface Ti treatment Metric Specifications: M3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, M10x1.5 Hex Handle Diameter: 1/4in Extension Rod: Length: Approx. 60mm / 2.36in, Shank Diameter: 1/4in Package List： 12 x Combined Tap Drill 1 x Extension Rod 1 x Plastic Case