6pcs Set Thread Drill Bits, HSS M3-M10 Titanium Coated Combination 1/4" Hex Thread Metric Thread Dr

GOOD DRILLING PRODUCT - These tap drill bits are suitable for drilling wood, plastic, thin copper, aluminum. They are used on a machine to do tapping, such as a lathe. and other soft metals (5-6 mm). Please note, these tap drills are not for hard materials (e.g. sheet steel). SUITABLE - These tap drill bits are use for drilling, tapping, cutting on soft metal(5-6mm), aluminum plate(5-6mm), iron, etc. They also are used on a machine to do tapping, such as a lathe. SELF-CENTERING POINT - no need for center drilling or center punching. Anti-wear: The back of the cone on the tap to prevent excessive drilling caused by thread damage MORE EFFICIENT - Drilling and tapping in one step. Quickly save processing steps and time costs, improve work efficiency. These HSS tap drill bits are excellent tools used for creating screw threads, cutting or forming the female part of the mating pair. HIGH QUALITY - These tapping drill bits are made from high speed steel and surface finished with nitriding for high hardness and rust resistance.