High hardness, anti-rust, strong and durable.2. There are total 12 pieces of taps in 2 different standards that you can use to tap various threads.3. Drilling and tapping at the same time saves you time and effort.4. The taps are designed with spiral flutes, and the chip removal process would be better.5. Their specifications are clearly marked on the surface, easy to choose. Specification: Tapping drill bits increase working efficiency by allowing drilling and to tap in a single pass. These HSS drill bits and taps are great tools used to create screw threads, to cut or form the female part of the mating pair. They are used on a machine to do tapping, such as a lathe. Features: High hardness, anti-rust, strong and durable. There are total 12 pieces of taps in 2 different standards that you can use to tap different threads. tapping at the same time, saving your time and effort.The taps are designed with spiral flutes, and the chip removal process would be better.Their specifications are clearly marked on the surface, convenient to choose.Specification:Material : high speed steel (titanium coating)Standard: metric, inchColor: Metric: Gold, Thumb: Silver Hex Shank: 6.35mm (1/4")Metric Size: M3*0.5mm, M4*0.7mm, M5*0.8mm, M6*1mm, M8* 25mm, M10* 5mm Inch size: 1/4-20NC, 12-24NC, 10-24NC, 10-32NC, 8-32NC, 6-32NCQuantity: 12 piecesWeight: approx. 192gPackage List:12 Thread Taps1 x Red Case