8-Piece Combination Drill Bit Set: HSS Hex Shank Drill Bits M3M10 Threaded Screw Tap Titanium Plating Copper Color

Made of high-speed steel, high strength, wear resistance, high hardness, robust and durable 1/4" hex shank (6.35 mm) quick change.

6 sizes set to perfectly meet your different needs. (M3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, M10x1.5)

A wear-resistant and sharpened drill bit ensures drilling speed and improves work efficiency.

Suitable for drilling wood, plastics, thin copper, aluminum, and other soft metals (3-4 mm), not suitable for hard materials (e.g., flat steel).

When drilling, water should be injected simultaneously to cool the drill bit. This will help increase its value. If the drill bit cannot be cooled during drilling, the speed will be reduced. The drilling depth should not be too high and should not be done too frequently.