Features SPIRAL GROOVE DESIGN: The tap adopt spiral groove design, the chip removal effect is better, more efficient HIGH HARDNESS AND LONG LIFE: Using high speed steel material, possess high hardness and long life, wear resistant and durable WIDE RANGE OF APPLICATIONS: Can be drilled in copper, brass, aluminum, metal plates and plastics for a wide range of applications DURABLE AND CORROSION RESISTANT: Metric tap drill come with Ti plated surface, durable and corrosion resistant 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 US System Specifications: 1/4-20NC, 12-24NC, 10-24NC, 10-32NC, 8-32NC, 6-32NC Hex Handle Diameter: 1/4in Extension Rod: Length: Approx. 60mm / 2.36in, Shank Diameter: 1/4in Package List:12 x Combined Tap Drill1 x Extension Rod1 x Plastic Case Note:Confirm the appropriate size before use, and do a good job of safety protection during use. Package List 12 x Combined Tap Drill 1 x Extension Rod 1 x Plastic Case