High Efficiency This tap drill improves work efficiency by enabling both drilling and tapping. High Efficiency This tap drill improves work efficiency by enabling both drilling and tapping. drilling and tapping at the same time. Main Function This tap drill is ideal for making threads, cutting or forming a concave part of a matching 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 tap drill comes in 6 different sizes, 6 different sizes of taps from M3 to M10 that can be used to connect a variety of threads. High Precision This tap drill uses a spiral flute design that facilitates the chip removal process. These tap drills for threading, which is generally more accurate because it eliminates human error.