General description Made of high-speed steel (HSS 4341), this set of 6 drill bits features high hardness and rust resistance for a long service life. The sizes included are M3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, and M10x1.5, catering to various drilling needs. These bits are designed for drilling, tapping, deburring, and countersinking in one operation, significantly improving work efficiency. Technical specifications Material: High Speed Steel 4341 Surface Treatment: Titanium Coated Shank: 1/4" (6.35mm) Hex Shank Sizes and Total Lengths: M3x0.5: 54mm M4x0.7: 54mm M5x0.8: 56mm M6x1.0: 57mm M8x1.25: 58mm M10x1.5: 58mm Usage These drill bits are suitable for drilling wood, plastic, thin copper, aluminum, and other soft metals (5-6 mm). It is recommended to inject water while drilling to cool the drill bit and enhance its longevity. If cooling is not possible, reduce the drilling speed and frequency to prevent damage. Other information Package includes: 6pcs Hex Shank Tap Drill Bits