The RODAC Tap and Die Set offers 110 pieces of SAE and MET Tungsten Steel 4N40 to NC10 10NF 32 to 3/4" NF16 M6 x 1.0 to M18 x 1.5. This set is perfect for creating new threads or repairing damaged threads on most metals such as carbon steel, cast iron, aluminum, brass, copper and stainless steel.