Professional tool for commercial or occasional use BSF (British Standard Fine) Tap and die set Manufactured from tungsten steel for strength and durability Ideal for creating and repairing popular BSF threads. Taps and dies are etched with the BSF sizes for easy and fast finding. The tap wrench has a screw adjustment and is suitable for all the taps. The die handle has an internal diameter of 25mm (1") with thumbscrew to hold components securely in place. SET Includes; Taper Taps, Plug Taps and Dies in the following sizes; 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. 1 x tap holder suitable for taps M3 M12 (1/16" 1/2") total length 200mm. 1 x die holder suitable for dies with 25mm (1") diameter total length 200mm.