Irwin Industrial Tools 1922 Hex Rethreading Die Set, 6-Piece This die set contains common sizes so you can get more done Re-threading dies help you repair damaged bolts and studs Set includes both HCS (high-carbon steel) pieces Sizes include: 1/8" - 27 NPT, 1/4" - 18 NPT, 3/8" - 18 NPT, 1/2" - 14 NPT, 3/4" - 14 NPT and 1" - 11-1/2 NPT dies Die set includes a wooden carrying case Hexagon re-threading die sets