One Set is Enough: Our 14 Pcs NPT pipe tap and die set includes 7 taps and 7 dies. A variety of taps and dies are sufficient for almost all maintenance and repair work. Superior Durability: We cooperated with the material research institute, our NPT taps are made of latest high speed steel and the NPT dies are made of latest high carbon steel. The mechanical properties of the material are higher, and the service life is longer. Precision Right Hand Thread: The latest production technology maximizes the processing accuracy of the thread. Our NPT taper pipe tap and hex die set fully meets the National Pipe Taper (NPT) standard. Portable Storage Box: An exquisite tool case will bring you great convenience, and the tools will be returned in time after use, reducing the risk of gadget loss. 1 Year Warranty: No matter what problems are encountered when using our NPT re-threading tap and die set, we will solve it for you within 6 hours, and one-year warranty! NPT pipe tap & die set includes 1/16"-27, 1/8"-27, 1/4"-18, 3/8"-18, 1/2"-14, 3/4"-14 and 1"-11-1/2.