Manufactured from Alloy Steel with HRC 58-62. Contents include 1 Adjustable Tap Wrench: 1/8" - 1/2" (3 - 13mm) capacity, 1 Adjustable Tap Wrench: 1/4" - 3/4" (6-19mm) capacity, 1 Die Holder for 1"(25mm) O/D Dies, 1 Die Holder for 1.1/2"(38mm) O/D Dies, 1 "T" type wrench 1/4"(6mm) capacity, 70 taps (1 of each taper and bottoming taps in 35 sizes as mentioned below), 22 1" O/D round dies for sizes up to M11 x 1.5, 13 1.1/2" O/D round dies for sizes up to M18 x 1.5. Taps Sizes(4NC40, 6NC32, 8NC32, 10NC24, 12NC24, 10NF32, 1/4"NC20, 1/4"NF28, 1/4"NS24, 1/4"NS40, 5/16"NC18, 3/8"NC16, 3/8"NF24, 7/16"NC14, 7/16"NF20, 1/2"NC10, 1/2"NF20, 9/16"NC12, 9/16"NF18, 5/8"NC11, 5/8"NF18, 3/4"NC10, 3/4"NF16, 1/8"NPT27, 1/8"NPT18, M6 x 1.0, 8 x 1.25, 10 x 1.5, 10 x 1.0, M11 x 1.5, 12 x 1.25, 12 x 1.75, 14 x 1.25, 18 x 1.5.)