1.With heat and wear resistance, the special design of flute and tooth-type with thousands times testing can improve working efficiency and reducing the working cost. 2.Suitable for processing through hole and blind hole of the internal thread. 3.The tap let dust tank in a spiral, have bigger spiral Angle, the smooth clearance, increase before work Angle, reduce the tapping torque. 4.Cutting efficiency of the taps is high, the clearance effect is good, strength, long service life, cutting torque is small, the machining accuracy stability etc. 5.The taps is suitable for ductile metal products and discontinuous surface of the screw hole tapping work, blind hole and deep blind. 6.Has simple structure, easy to use; can be manual operation, also can work on the tool machine, is widely applied in the production.