1" NPT

  1"  NPT  Tap - Taper Threads.
 
  11.5 tpi Standard NPT pitch
  95mm Overall, 50mm Cutting Length, 28.5mm Shank and 21mm Square Drive.   6 Flutes, Centred Both Ends.
  Genuine Presto, top quality
  Used but sharp and no visible damage to teeth.