Original Combo Thread Checker Set, Inch/Metric SWTC-26

The S & W Manufacturing Original Thread Checker Combo (SWTC-26) is a 26-piece identification set that verifies both inch (UNC/UNF) and metric (M) fastener threads at the point of use. It combines the most common 14 inch sizes and 12 metric sizes on a compact combo format to quickly distinguish similar threads during assembly, maintenance, or QA, reducing rework and inventory errors. Inch gauges use a clear zinc finish and metric gauges use black oxide for instant visual differentiation; the design is covered under U.S. Patent 7,877,882.