39 Pcs Tap And Die Set, Metric Sae Essential Threading Tool Kit For Cutting PTSTEL tap dies made of industrial grade GCR15 bearing steel for long service life Set Includes: High-quality Durability: PTSTEL metric SAE tap and die set is made of industrial grade GCR15 bearing steel, which is non-corrosive and durable, extending the life of the taps and dies Efficient Cutting: All cutting teeth of the tap and die set are precisely CNC machined and accurately heat treated to a Rockwell hardness 60 HRC to achieve the best performance of the thread Wide Range of Applications: The cutting thread tool set is processed with internal thread and external thread, and strong torsional force is ideal for cutting steel, copper, aluminum, cast iron and other materials Easy to Storage: Each taps and dies set is equipped with plastic tool box with corresponding scales engraved. You will never get the wrong size when you use it, and it can be easier to place back for next use. Most Complete Size: 17pcs metric SAE tap and die set: SAE: 5/16-18, 3/8-16, 7/16-14, 1/2-13, NPT tap (1/8-27), #4-40, #6-32, #8-32, 1/4-20 METRIC: M3x0.5, M4x0.7, M5x0.8, M6X1.0, M7x1.0, M8x1.25, M10x1.5, M12x1.75