【High Efficiency】: This tap drill bit improves working efficiency by allowing drilling and tapping at the same time.【Main Function】: This tap drill bit ideal for making threads, cutting or forming a concave part of a mating pair.【High Quality】: This tap drill bit is made of high speed steel and has a nitride surface for high hardness and rust resistance.【M3 - M10】: This tap drill bit has 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 tap drill bit uses a spiral groove design which facilitates the chip cleaning process. These tapping drill bits are for tapping, which is generally more accurate as it eliminates human error.SpecificationsMaterial: High Speed Steel (Titanium Coated)Color: As Pictures ShowHex Shank: 6.35mm (1/4")Standard: MetricThread: M3, M4, M5, M6, M8, M10Pitch: 0.5mm, 0.7mm, 0.8mm, 1.0mm, 1.25mm, 1.5mmUsed On: MachineFunction: DrillingQuantity: 6 is committed to providing each