6542 high speed steel material, harder and more durable, can even be used to drill 2mm 304 steel plate. With titanium coating, anti-rust and anti-corrsion, ensures long service life, reliable to use. Total 6pcs taps in different sizes of M10 / M8 / M6 / M5 / M4 / M3, can be used to tap various threads. Use an electric drill to complete drilling, tapping and deburring/reaming in one operation, saving labor and time. Suitable for drilling some types of carbon steel and ordinary steel, copper and aluminum-magnesium alloys.