1. 1/2" BSP

   1. 1/2"  BSP 11 tpi parallel thread.
 
  6 Flute, 40mm Flute Length & 125mm O/A Length.
  34.5mm  (1. 11/32")  Shank & 28mm  (1. 3/32")  Squre Drive.
  Centred both Ends.
  Minimum use and absolutely pristine
  Manufactured by Brooke,  UK.