OSG Threading Tap - BSF Spiral Point HSS-E - Steam Oxide Coated - Through Hole - 7/8 x 11The OSG BSF Spiral Point Threading Tap is a precision through hole tapping tool designed for British Standard Fine (BSF) threads. Crafted from HSS E cobalt and finished with a steam oxide coating, it delivers durable, heat resistant performance for demanding machining tasks. Thread size and type: 7 8" diameter, 11 TPI BSF through hole threading tap for accurate BSF threads. Material: HSS E cobalt blends hardness and wear resistance for extended tool