M26 - 1.5p

M26 x 1.5mm Pitch Metric Fine Metric Spiral Point (Chip Breaker) Tap.
 
  140mm Overall, 30mm Flute Length, 18mm Shank and 14mm Square Drive.  4 Flutes, Centred Both Ends and
  Clean Sharp & Undamaged Cutting Teeth, but slightly scruffy on the shank.
  Sensibly priced due to this.
 
  Titex Plus brand from Walter Carbide Germany, absolutely Premium Tooling.