6pcs HSS Countersink Tap Drill Bit Set Metric Thread Holder Titanium Coated 1/4" Cutting Tool Combination Hex Shank for M3 M10

【High Hardness】: These hand drill taps are made from high speed steel and surface finished by nitriding for high hardness and rust resistance. 【6Pcs Set】: There are total 6 pieces of taps in different sizes from M3 to M10 that you can use for tapping various threads. 【High Performance】: This thread tap drill bit set is designed with spiral flutes and the chip clearing process would be better. 【2 in 1 Combination】: They are taps with drilling function, used to drill a hole and cut new threads at the same time, you will have a smooth tapping experience with them. 【High Accurate】: This HSS tap drill bit set is used on a machine to do the tapping, generally more accurate because human error is eliminated.