This comprehensive SAE tap and die set is designed for threading and re-threading a variety of materials with precision. It includes a selection of taps and dies for UNC, UNF, and NPT threads, along with essential tools for ease of use and accurate threading. Sizes Included: UNC Tap & Die Sizes : 4-40, 6-32, 8-32, 10-24, 12-24, 1/4"-20, 5/16"-18, 3/8"-16, 7/16"-14, 1/2"-13 UNF Tap & Die Sizes : 10-32, 1/4"-28, 5/16"-24, 3/8"-24, 7/16"-20, 1/2"-20 NPT Tap & Die Size : 1/8"-27 Tools Included: Tap Wrench : Fits 1/16" - 1/2" T-Type Tap Wrench : Fits 1/16" - 1/4" Die Wrench : 1" O/D Screwdriver Screw Pitch Gauge