1/2"-28 Tap and Die Set Right Hand Thread 2 Pieces, 1 Titanium CoatedTap 1 SS Die) Thread Size: 1/2", 28 TPI (Thread-Per-Inch) UNEF Right Handed Thread Die Dimension: 1-1/2" Outer Diameter Titanium Nitride Coated: Add an extremely hard surface to the tool and prolong it's life by 3 times. Rust free, too. Lifetime Warranty