Features High Quality: These taps are made of high-speed steel and are surface refined by nitrizing to ensure a high hardness and rust resistance Suitable types: There are a total of 6 taps 12 pcs in different sizes from M3 to M10, which you can use to thread cutting different threads Practical Function:This is a tap with drilling function, which can be used to drill a hole and cut new threads at the same time. They have smooth thread cutting with them Perfect Design:Taps are designed with spiral flutes and the chip clearing process would be better. Stable and Durable:These taps are used on a machine for thread cutting. This is generally more accurate as human errors are avoided Drill tap bits increase efficiency of operation by allowing for drilling and tapping to be accomplished in a single pass. These HSS drill and tap bits are great tools used to create screw threads, to cut or form the female portion of the mating pair. They are used on a machine to do the tapping, such as a lathe. Features: High hardness, rustproof, solid and durable.There are total 12pcs of taps in 2 different standards that you can use for tapping various threads.Drilling and tapping at the same time, save you time and effort.Taps are designed with spiral flutes and the chip clearing process would be better.Their specifications are marked clearly on the surface, convenient to choose. Specification: Material: High Speed Steel (Titanium Coated) Standard: Metric, Inch Color: Metric: Gold, Inch: Silver Hex Shank: 6.35mm(1/4") Metric Size: M3*0.5mm, M4*0.7mm, M5*0.8mm, M6*1mm, M8*1.25mm, M10*1.5mm Inch Size: 1/4-20NC,12-24NC,10-24NC,10-32NC,8-32NC,6-32NC Quantity: 12pcs Weight: Approx. 192g Package List: 12 x Thread Tap 1 x Red Case Package List