40-Piece Premium SAE Tap and Die Set is the perfect choice for your hand threading jobs at home, garage and shop. It can be used to either cut new threads or chase existing threads. This set is made from highly durable GCr15 bearing steel, and cuts through a wide range of metal pipes and rods including carbon steel, cast iron, stainless steel, aluminum, brass, copper and much more. All the cutting teeth are professionally CNC (computer numerical controlled) machined and heat treated to Rockwell hardness 60 HRC for providing aggressive, clean and precise threading results. The taps and dies also feature a tapered design, allowing an easier start and preventing over threading. Set Includes: (17) Taps for Internal Threads; (17) Dies for external Threads; (1) Long Handle Adjustable Tap Wrench; (1) T-Handle Tap Wrench; (1) Adjustable Die Wrench; (1) Mini 1/8 Flat Screw Driver; (1) Thread Pitch Gauge; (1) Heavy Duty Storage Case; Tap and Die Sizes: Coarse Thread (NC): 4-40 NC, 6-32 NC, 8-32 NC, 10-24 NC, 12-24 NC, 1/4-20 NC, 5/16-18 NC, 3/8-16 NC, 7/16-14 NC, 1/2-13 NC; Fine Thread (NF): 10-32 NF, 1/4-28 NF, 5/16-24 NF, 3/8-24 NF, 7/16-20 NF, 1/2-20 NF; Pipe Thread (NPT): 1/8 NPT 27. Return Policy All of our items come with a 30-day free return policy. If you need to return, please contact us, let us know the detailed problem and send us some pictures for confirmation. We reserve the right to refuse any returns for objective reasons. Shipping Policy All of our items are shipped free with tracking numbers. Orders will be shipped within 3 working days upon receipt of payment. Most orders will be shipped within 1 working day. In most cases, shipping takes 8-12 working days.