1These taps are made from high speed steel and surface finished by nitriding for high hardness and rust resistance 2There are total 6 pieces of taps in different sizes from M3 to M10 that you can use for tapping various threads 3Taps are designed with spiral flutes and the chip clearing process would be better 4They 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 5These taps are used on a machine to do the tapping, generally more accurate because human error is eliminated Description: Drill tap bits increase efficiency of operation by allowing for drilling and tapping to be accomplished in a single pass. These HSS drill and tap bits are great tools used to create screw threads, to cut or form the female portion of the mating pair. They are used on a machine to do the tapping, such as a lathe. Machine tapping with these taps is faster, and generally more accurate because human error is eliminated. Features: These taps are made from high speed steel and surface finished by nitriding for high hardness and rust resistance. There are total 6 pieces of taps in different sizes from M3 to M10 that you can use for tapping various threads. Taps are designed with spiral flutes and the chip clearing process would be better. 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. These taps are used on a machine to do the tapping, generally more accurate because human error is eliminated. Specifications: Material: High speed steel(titanium coated ) Color: As pictures show Hex Shank: 6.35mm(1/4") Standard: Metric Thread Size: M3, M4, M5, M6, M8, M10 Pitch: 0.5mm, 0.7mm, 0.8mm, 1.0mm, 1.25mm, 1.5mm Used On: Machine Function: Drilling Quantity: 6 Package Includes: 6 x Taps