For repairing damaged and worn threads Also used for creating new tools from raw steel These Irwin taps and dies achieve the precise fit needed for these jobsConstructed of high carbon steelMachine Screw Plug Tap and 5/8" Hexagon Dies in sizes: 4 - 40 NC, 6 - 32 NC, 8 - 32 NC, 10 - 24 NC, 10 - 32 NF, 12 - 24 NC Fractional Plug Tap and 1" Hexagon Dies in sizes: 1/4" - 20 NC, 1/4" - 28 NF, 5/16" - 18 NC, 5/16" - 24 NF, 3/8" - 16 NC, 3/8" - 24 NF, 7/16" - 14 NC, 7/16" - 20 NF, 1/2" - 13 NC, 1/2" - 20 NF Metric Plug Tap and 5/8" Hexagon Dies in sizes: 3mm - 0.50, 4mm - 0.70, 4mm - 0.75, mm - 0.80, 5mm - 0.90, 6mm - 1.00 Metric Plug Tap and 1" Hexagon Dies in sizes: 7mm - 1.00, 8mm - 1.00, 8mm - 1.25, 9mm - 1.00, 9mm - 1.25, 10mm - 1.25, 10mm - 1.50, 11mm - 1.50, 12mm - 1.50, 12mm - 1.75 Pipe Thread Plug Tap and 1" Hexagon Dies in sizes: 1/8" - 27 NPT, 1/8" - 28 BSP Threading Tools: Adjustable Die Stock - 1" Dies, Plain Die Stock - 5/8" Hexagon Dies, Adj. Handle Tap Wrench - Taps No. 0 to 1/2", Two-in-One Tap Wrench - Taps 1/4" to 1/2", T-Handle Wrench - Taps No. 0 to 1/4", 16 Leaf Metric Thread Pitch Gauge, 18 Leaf Standard Thread Pitch Gauge, Plastic Case