1. 1/4" BSF

1. 1/4"  BSF  Tap. 1st Cut / Taper Tap Left Hand Threads
 
  9 tpi Standard BSF pitch, 145mm Overall, 65mm Cutting Length, 26mm Shank and 19.5mm Square Drive.  4 Flutes, Centred Both Ends.
 
  Old, but Minimum use and in Excellent Condiction.
  Made in UK by now defunct Premium Brand L. A. L.  (Lehman, Archer & Lane)