High efficiency: This tapping drill improves operating efficiency by allowing drilling and tapping at the same time.Main function: This tapping drill is ideal for making threads , cut or form a concave part of a mating pair.High quality: This tap drill is made of high speed steel and has a nitride surface for high hardness and rust resistance.M3 - M10: This tapping bit comes in 6 different sizes, 6 different sizes of taps from M3 to M10 which can be used to connect a variety of threads.High precision: This tapping bit uses a spiral groove design which makes the chip cleaning process easier. These tapping drills for tapping, which is generally more accurate as it eliminates human errors. Features Material: High speed steel (titanium coated) Color: as pictures show Hex shank: 6.35 mm (1/4 ) Standard: metric Thread: M3, M4, M5, M6, M8, M10 Distance: 0.5mm, 0.7mm, 0.8mm, 1.0mm, 1.25mm, 1.5mm Used on: machine Function: drilling Quantity: 6 Sold by the Bianco FR store