<h3>About this item</h3><ul> <li>[Complete Thread Chaser Set] This 49-piece thread repair kit includes 22 taps and 24 dies covering UNC, UNF, and Metric sizes—from 1/4"-20 to 5/8"-18 and M6 to M14—providing a complete solution for restoring damaged threads on automotive and machinery parts without costly replacements.</li> <li>[All-in-One Master Kit] Includes 49 total pieces: SAE Coarse (UNC, 5/8"-11, 9/16"-12, 1/2"-13, 7/16"-14, 3/8"-16, 5/16"-18, 1/4"-20), SAE Fine (UNF, 5/8"-18, 9/16"-18, 1/2"-20, 7/16"-20, 3/8"-24, 5/16"-24, 1/4"-28), and Metric (M14x1.5, M12x1.75, M12x1.5, M12x1.25, M11x1.5, M10x1.5, M10x1.25, M10x1.0, M8x1.25, M6x1.0) chasers.</li> <li>[High-Strength Carbon Steel Construction] Each hex-shaped tap and die is made from heat-treated carbon steel with black oxide coating for 3X longer tool life, ensuring durability during heavy-duty use on rusted fasteners, spark plug threads, and engine block holes.</li> <li>[Automotive &amp; Machinery Application] Ideal for professional mechanics and DIYers, this thread chaser set efficiently repairs threads on cylinder heads, wheel studs, axles, and hydraulic fittings, guaranteeing smooth bolt installation and preventing cross-threading.</li> <li>[Quick-Identify Color-Coded System] Features color-coded tools (UNC-silver/UNF-black/Metric-gold) for instant size recognition, stored in a heavy-duty blow-molded case with custom slots—keeping your thread repair kit organized for job site portability.</li> <li>[Pro-Grade Efficiency &amp; Compatibility] Hexagonal design works with standard wrenches and sockets, enabling fast thread chasing in tight spaces. Includes three thread files for deburring and finishing, making it a versatile tap and die set for automotive, plumbing, and equipment maintenance.</li> </ul>