Features High hardness, rustproof, solid and durable. Drilling and threading at the same time, saves you time and effort. The faucets are designed with spiral flutes and the chip cleaning process would be better. Its specifications are clearly marked on the surface, convenient to choose. There are a total of 12 pieces of faucets in 2 different standards that you can use to touch various threads. Drill bits increase operation efficiency by allowing drilling and threading to be done in a single pass. These HSS drill and male drill bits are excellent tools used to create screw threads, to cut or form the female part of the coupling pair. They are used in a machine to make the threading, like a lathe. Specification: Material: Fast Steel (Titanium Coated) Standard: Metrics, Inches Color: Metric: Gold, Inches: Silver Hexagon stem: 6.35 mm (1/4") Metric size: M3*0.5mm, M 4*0.7mm, M5*0.8mm, M6*1mm, M8*1.25mm, M10*1.5mm Inches: 1/4-20NC,12-24NC,10-24NC,10-32NC,8-32NC,6-32NC Quantity: 12 pieces Weight approximately. 192 g Package List: 12 x Male Thread 1 x Red Case Package List