This product combined drilling and tapping function into on. Its structure is unique and is of multiple uses. Only move the tightening ring of the chuck, the drilling and tapping sleeves can be rep aced rapidly. When drilling the Morse sleeve can be locked automatically; when tapping, torque overloaded device can slide smoothly to prevent the screw tape from being broken. For screw taps of different diameter, only the screw nut is adjusted, different slide torque can be obtained and it is convenient and fast.It is suitable for operating on lathe. Drilling and boring machines, the labor strengthen can be greatly reduced and the assist time is reduced by more than 80﹪.