BSF Tap And Die Set 20pc British Standard Fine 3/16" - 1/2" Whitworth TE741
3/16" x 32 BSF, 1/4" x 26 BSF, 5/16" x 22 BSF, 3/8" x 20 BSF, 7/16" x 18 BSF, 1/2" x 16 BSF. BSF (British Standard Fine) Tap and die set. Ideal for creating and repairing popular BSF threads.