Whether creating new threads from raw steel or repairing damaged and worn threads, achieving a precise fit is essential. IRWIN Industrial Tools® sets the standard for delivering quality every step of the way in your threading applications. Machine screw sizes 4-40 thru 12-24, Pipe sizes: 1/8" - 27 NPT and 1/8" - 28 BSP Fractional 1/4"-1/2" and Metric 3-12mm Includes Tools. Adjustable Die Stock, Adjustable Handle Tap Wrench, Two-in-One Tap Wrench and T-Handle Wrench. 16 Leaf Metric Thread Pitch Gauge and 18 Leaf Standard Thread Pitch Gauge.