Sandvik R166

  Sandvik R166 T-Max Internal Thread Cutting Tool.
  Minimum use and pristine, heavy duty top quality tooling.
 
  20mm Diameter, 140mm Overall, 100mm Shank Length & internal coolant feed.
  For Sandvik R166 22mm Inserts.
  It will take a standard NR22 inserts with an M5 Screw, but it's not a perfect fit so not recommended.
  Using Sandvik R166 inserts give perfect, solid vibration free heavy duty work.