OSG Threading Tap - UNC Spiral Flute HSS-E - Steam Oxide Coated - Blind Hole - No. 2 x 56Achieve precise internal threads in blind holes with the OSG UNC Spiral Flute Threading Tap No. 2 x 56. Designed for professional machinists and rigorous shop environments, it delivers durable performance and consistently accurate threads in demanding materials. No. 2 UNC Thread: No. 2 size with 56 threads per inch (UNC) for standard internal threads. Flute Design: Spiral flute geometry enhances chip evacuation, reducing clogging in blind hole taps.