Metric Thread Checker Gauge Set SWTC-M21

The S & W Manufacturing SWTC-M21 metric thread checker is a 21-piece gauge set for fast, accurate identification of both male and female metric threads. Every size is permanently stamped onto each gauge, mounted on a flexible wire loop, and designed for ergonomic use. With clear differentiation between inch/metric finishes and precision manufacturing, it is essential for mechanics, machinists, and maintenance professionals working in metric systems.