EFFICERE 60-Piece Premium Tap and Die Sets is your best choice tools for hand threading jobs at home, garage, shop and work sites. It is perfect for a wide range of applications, such as auto repairs, metal fabrication, machinery, plumbing and a lot more. It can be used to both cut new threads and chase / renew 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: (27) Taps; (27) Dies; (1) Adjustable Tap Wrench; (1) T-handle Tap Holder; (1) Adjustable Die Wrench; (1) Flat Screw Driver; (2) Thread Pitch Identifier; (1) Storage Case; Tap and Die Sizes: (20-Piece) Metric taps and dies: M3 x 0.5, M4 x 0.7, M5 x 0.8, M6 x 1.0, M7 x 1.0, M8 x 1.25, M9 x 1.25, M10 x 1.0, M10 x 1.5, M12 x 1.75; (20-Piece) Numbered and Standard Fractional taps and dies for Coarse threads (UNC): #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; (12-Piece) Numbered and Standard Fractional taps and dies for Fine threads (UNF): #10 - 32 NF, 1/4? - 28 NF, 5/16? - 24 NF, 3/8? - 24 NF, 7/16? - 20 NF, 1/2? - 20 NF; (2-Piece) Pipe Threader (NPT): 1/8? - 27 NPT;