OSG Threading Tap - BSW Spiral Flute HSS-E - Steam Oxide Coated - Blind Hole - 1/2 x 12The OSG BSW Spiral Flute Threading Tap in 1 2 x 12 is a precision tool designed for machinists who need clean, reliable internal threads in blind holes. Built from cobalt enhanced HSS and finished with a durable steam oxide coating, it delivers long life and steady performance in demanding metalworking tasks. Threading standard: BSW (1 2" diameter, 12 TPI) designed for British Standard Whitworth threads in blind holes. Material: HSS E with cobalt for