OSG Threading Tap - BSW Spiral Flute HSS-E - Steam Oxide Coated - Blind Hole - 9/16 x 12Engineered for precision threading in blind holes, the OSG BSW Spiral Flute Threading Tap delivers clean, accurate threads with extended tool life. Built for professional shops, it combines cobalt enhanced HSS E with a durable Steam Oxide coating to withstand demanding tapping tasks. Thread size: BSW 9 16" 12 tapping size for accurate British Standard Whitworth threads in blind holes Flute design: Spiral flute for efficient chip evacuation and reduced