The taps are high speed steel and feature a nitrided surface finish for high hardness and high rust resistance. There are a total of 6 pieces of taps in different sizes ranging from M3 to M10 that can be used to tap various threads. The taps are designed with spiral flutes and the chip cleaning process would be better. With drilling function, used to drill a hole and cut new threads at the same time. These taps are used on a machine to perform tapping, which is usually more precise. Description: Tap drills increase operation efficiency by allowing drilling and tapping in a single pass.These HSS drills and taps are excellent tools for creating screw threads, cutting or forming part female of the pair They are used on a machine to perform tapping, such as a lathe. Automatic tapping with these taps is faster and generally more accurate because human error is eliminated. Features: The taps are high speed steel and feature a nitrided surface finish for high hardness and high rust resistance. There are a total of 6 pieces of taps in different sizes ranging from M3 to M10 that can be used to tap various threads. The taps are designed with spiral flutes and the chip cleaning process would be better. With drilling function, used to drill a hole and cut new threads at the same time. These taps are used on a machine to perform tapping, which is usually more precise. Features: Material: high speed steel (titanium coated) Color: as pictures show Hexagonal shank: 6.35 mm (1 or 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 The package includes: 6 x taps